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  1. #26
    Join Date
    Dec 2002
    Location
    Bucks County, Pa
    Posts
    6,530

    Default Re: piston opinions wanted

    Quote Originally Posted by cobravii View Post
    Is race tec and auto tec the same company? I'm wondering because they replied to me and sent me the info request sheet for me to fill out to build the pistons.....
    Same company. Race tec is race oriented and uses 2618 aluminum alloy. Auto tec is more street performance oriented and uses 4032 High Silicone Aluminum Alloy.
    Those two materials expand at different rates when heated, among other differences.

    In general, the 'street' piston will need more clearance when exposed to higher loads/higher heat..... towing, supercharging, nitrous, etc. You can run it tighter for normal use.
    The 'race' piston will expand eve more and need more clearance than the street piston.
    Walt K
    (1)'66 GS Astro Blue, 13.41 et (2)'66 GS Saddle Mist, L76 Q-jet option, 1 of 132 (3)'66 GS Flame Red, Calif car (4)'66 GS Silver Mist, 4 speed (5)'66 Special, Flame Red, 300 (6)'79 Turbo Regal, 14.1 et (7)'65 GS 4 speed 'vert

  2. #27
    Join Date
    Jul 2004
    Location
    ct.
    Posts
    3,581

    Default Re: piston opinions wanted

    A GREAT suggestion. Check into getting them coated. I know Johnny, Bulldog66GS, had his done. Maybe he can chime in.


    Tom T.
    Tom Telesco
    Classic and Muscle Automotive
    12 Cook St.
    Norwalk, CT 06853-1601
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads
    Custom Forged Pistons
    Many parts to numerous to list
    "If I can't get it, you don't need it!"

  3. #28

    Default Re: piston opinions wanted

    Credit is due where credit is due, and its most certainly due to the man himself, folks!
    Like I said, give Mr. Telesco a call to get a set of these designed for YOUR build- you'll thank yourself later down the road...

    Thanks again, Mr. Telesco.[/QUOTE]

    Glad we got that sorted out. Seriously folks, put Tommy's experience to work for you. his price is very competitive with what you'd buy a similar spec'd piston for out the door from any serious manufacturer, and he's done all the hard work and research. Plus, we gotta keep him fed..!

    That said, I'm going to visit my pistons this AM at the machinists. I had been carrying them around, bringing them to work and out to dinner, family holidays, etc..but Tom insisted it was time to gently build a motor around them. I'm still having separation anxiety, they were that pretty.
    Attached Images Attached Images
    Rhett

    65 Gran Sport Convertible
    71 GS455 - Unconfirmed Stage1
    73 Gran Sport Stage1 4spd
    72 Pontiac Grand Ville Convertible

    71 GS455 Conv. 4spd Tribute - Sold, now a Swedish citizen
    66 Corvair Monza 140 4spd Convertible - Sold, presumed Hurricane Sandy victim

  4. #29
    Join Date
    Jun 2005
    Location
    hazard,ky
    Posts
    5,871

    Default Re: piston opinions wanted

    Quote Originally Posted by telriv View Post
    A GREAT suggestion. Check into getting them coated. I know Johnny, Bulldog66GS, had his done. Maybe he can chime in.


    Tom T.
    would coating cast pistons be a good idea? would it live with boost?
    66 skylark 2 dr hartop...... in progression
    07 silverado 3500 hd 6.0
    12 kia sorento sx
    99 f150
    89 dodge spirit
    http://smg.photobucket.com/albums/v237/nekkidhillbilly/

  5. #30
    Join Date
    Nov 2013
    Posts
    1,472

    Default Re: piston opinions wanted

    Some cast pistons come with a coating already. Their instructions state to NOT measure with the coating.
    It's more common these days to use them with coated skirts, esp. in situations where some clearance is thought to be reduced.
    There are a few different kinds of coatings available for skirts.
    Consult piston makers and coaters for more info.

  6. #31
    Join Date
    Sep 2012
    Location
    MI.
    Posts
    2,868

    Default Re: piston opinions wanted

    Quote Originally Posted by nekkidhillbilly View Post
    would coating cast pistons be a good idea? would it live with boost?
    What kind of coating are you asking about? A thermo-barrier type coating for the top of the piston to handle more heat, or a skirt type coating to stop piston slap in a loose bore?




    Derek
    64 Skylark,401 Nailhead,ST400,3.23:1Posi
    64 Skylark,305Vortec sbc,700R4,12blt Posi 3.73,low 14s. A sbb 300 stroker planned for it.
    72 Skylark Convert. in progress, Not yet assembled 455 .020 over,70 heads with stage1 valves,gasket matched and bowl blended,transmission to be determined.
    65 Chevy Impala,4,400lbs,383sbc,700R4,3.07posi,1.80 60' foot time low 13s @101mph,15mpg city,24mpg highway

  7. #32
    Join Date
    Dec 2002
    Location
    Bucks County, Pa
    Posts
    6,530

    Default Re: piston opinions wanted

    Quote Originally Posted by nekkidhillbilly View Post
    would coating cast pistons be a good idea? would it live with boost?
    The problem with cast pistons and boost is that detonation may eventually result in piston breakage. Those domes can crack and collapse in the center. In those situations, coatings don't make much of a difference.
    I know you were planning on efi and maybe a computer controller ignition? If you could add a detonation sensor to reduce boost or timing, that would be ideal. Adding H2O or methanol injection will help prevent detonation too.
    The old turbo Saabs (1980's) had a real nice APC control (Automatic Pressure Control) that would bleed off boost when it sensed detonation. My 79 Turbo Regal had a det sensor that would just reduce timing.... a much inferior method, but it was 10 years earlier than the better Saab APC.

    But We digress..... we have a habit of doing that don't we!

    Johnny went with a thermal coating on the domes to keep the heat in the chamber to maximize power. Maybe he had the skirts coated with something else.... that'll reduce scuffing.
    Walt K
    (1)'66 GS Astro Blue, 13.41 et (2)'66 GS Saddle Mist, L76 Q-jet option, 1 of 132 (3)'66 GS Flame Red, Calif car (4)'66 GS Silver Mist, 4 speed (5)'66 Special, Flame Red, 300 (6)'79 Turbo Regal, 14.1 et (7)'65 GS 4 speed 'vert

  8. #33
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    15,233

    Default Re: piston opinions wanted

    I personally would not use a cast piston for a boosted application over 6 psi but under that they should be fine if the tune is spot on.... Detonation and RPM kills parts not so much max Hp or boost levels. A $1000 piston will hold up a bit better to detonation but not for too long, it will still break. But a $100 cast piston could handle a ton of power if the tune was spot on... Of course if it detonated the cast piston would pretty much fall apart.

    I ran a stock Buick 350 engine with just some home porting on the heads and mild cam to 8000 RPM under 17 PSI and the short block survived just fine. Had some valve float at around 7000 lol!

    Info about coatings:

    http://www.jepistons.com/TechCorner/PistonCoatings.aspx
    __________________________________________________ __________________________________
    My book called Small Block Buick Performance covering the V6, 215, 300, 340, and Buick 350 engines will be released soon.

    http://www.v8buick.com/forumdisplay....rformance-Book
    __________________________________________________ ____________________________
    1970 Buick Skylark Turbo 350 street/strip

  9. #34
    Join Date
    Jul 2004
    Location
    ct.
    Posts
    3,581

    Default Re: piston opinions wanted

    MY PISTONS ARE NOT CAST THEY ARE 4032 FORGINGS. Include Pins, Pin Fitting & Rings.
    Tom Telesco
    Classic and Muscle Automotive
    12 Cook St.
    Norwalk, CT 06853-1601
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads
    Custom Forged Pistons
    Many parts to numerous to list
    "If I can't get it, you don't need it!"

  10. #35
    Join Date
    May 2004
    Location
    Manitoba, Canada
    Posts
    6,225

    Default Re: piston opinions wanted

    Quote Originally Posted by cobravii View Post
    Ok, I sent info requests off to JE and autotec.

    Thanks everyone for your info, much appreciated.

    BTW if anyone has a set of .060 over 425 pistons for sale I'd be interested.
    Larry, you CANNOT go wrong with Tom Telesco's forged pistons. If you're unsure about him, please understand that he LIVES AND BREATHES nailheads! From one Canuck to another, he will provide the best piston for your engine.

    Many of us on this forum, including me, have had the pleasure of listening to him talk about these engines and love for all things Buick.
    Tom B
    05 Legend Lime Mustang GT convert.
    07 Lincoln Navigator

    No more Buicks....for the time being. Can I still play here?

    There's no such thing as a free lunch. Get used to it.

  11. #36
    Join Date
    Jun 2005
    Location
    hazard,ky
    Posts
    5,871

    Default Re: piston opinions wanted

    Quote Originally Posted by telriv View Post
    MY PISTONS ARE NOT CAST THEY ARE 4032 FORGINGS. Include Pins, Pin Fitting & Rings.
    I am aware I was askin in general. can you have a low comp version produced?
    66 skylark 2 dr hartop...... in progression
    07 silverado 3500 hd 6.0
    12 kia sorento sx
    99 f150
    89 dodge spirit
    http://smg.photobucket.com/albums/v237/nekkidhillbilly/

  12. #37
    Join Date
    Apr 2011
    Location
    N. Mankato, MN
    Posts
    700

    Default Re: piston opinions wanted

    I'll be calling Tom when I need pistons.
    Jim
    N. Mankato, MN

  13. #38
    Join Date
    Jul 2004
    Location
    ct.
    Posts
    3,581

    Default Re: piston opinions wanted

    As low as 8-1 for MAX boost.
    Tom Telesco
    Classic and Muscle Automotive
    12 Cook St.
    Norwalk, CT 06853-1601
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads
    Custom Forged Pistons
    Many parts to numerous to list
    "If I can't get it, you don't need it!"

  14. #39
    Join Date
    Oct 2002
    Location
    East Coast
    Posts
    1,269

    Default Re: piston opinions wanted

    Quote Originally Posted by nekkidhillbilly View Post
    I am aware I was askin in general. can you have a low comp version produced?
    Your forging needs a .300" thick crown and the top ring-land at least .250" down from the top (more is better) for a serious boosted application. You also want to make the best of the available quench and make sure there are no hot spots on the piston or in the chamber. I am sure Tom has already addressed the latter concerning his pistons, but the supercharged crown and top ring-land improvements would add weight and possibly push the oil rings into the pin area in a NA application. I am not sure how his pistons measure with respect to these particular demands of supercharging.

    Cheryl
    14 Nissan Leaf SL (100% Electric Vehicle)
    05 Toyota Prius
    95 Suburban Turbo Diesel 2500

  15. #40
    Join Date
    Jul 2004
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    ct.
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    Default Re: piston opinions wanted

    The top ring land is .300" as opposed to .200" stock. I could specify MORE dome thickness if it felt is nec. These type pistons are used in boosted apps up to 850 HP with proper tuning. Normally NO PROBLEM with 5-6 pds.

    Quench is not as important on a pressurized situation as on a NA application because your making the nec. additional air needed to offset the problem.


    Tom T.
    Tom Telesco
    Classic and Muscle Automotive
    12 Cook St.
    Norwalk, CT 06853-1601
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads
    Custom Forged Pistons
    Many parts to numerous to list
    "If I can't get it, you don't need it!"

  16. #41
    Join Date
    Jun 2010
    Location
    near Birmingham (Alabaster)Alabama
    Posts
    12,242

    Default Re: piston opinions wanted

    Quote Originally Posted by telriv View Post
    .0045" will cause light piston slap at cold start but should quiet down when fully warmed. Also, another option would be to have the pistons "Knurled" to make the clearances a smudge tighter. I don't know if this can be done with these pistons. I will call & ask if you'd like Will.

    Auto Tec will tell you you will have to go through myself to get these pistons that we spent over 1 1/2 yrs. working on. If you had spent the amount of time & $$$$ nec. to do this that I/we have spent you wouldn't be too happy being cut out would you???




    Tom T.
    "Auto Tec will tell you you will have to go through myself to get these pistons that we spent over 1 1/2 yrs. working on."

    That's only fair.

    Have you made any 322 pistons?
    "Bulldog" James A. Miller

  17. #42
    Join Date
    Jul 2004
    Location
    ct.
    Posts
    3,581

    Default Re: piston opinions wanted

    Not as of yet but many have asked. The answer is YES!!!!
    Tom Telesco
    Classic and Muscle Automotive
    12 Cook St.
    Norwalk, CT 06853-1601
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads
    Custom Forged Pistons
    Many parts to numerous to list
    "If I can't get it, you don't need it!"

  18. #43
    Join Date
    Oct 2002
    Location
    East Coast
    Posts
    1,269

    Default Re: piston opinions wanted

    Quote Originally Posted by telriv View Post
    Quench is not as important on a pressurized situation as on a NA application because your making the nec. additional air needed to offset the problem.
    Actually, that compounds the problem. Power adders increase the temperature (even with inter-cooling) of a larger more volatile charge subject to greater cylinder pressure. You want a good quench in that situation along with anything else that will cool the charge (porting or increased intake dwell time). We have learned a few things with our supercharged Cobra over the last 13 years.

    Cheryl
    14 Nissan Leaf SL (100% Electric Vehicle)
    05 Toyota Prius
    95 Suburban Turbo Diesel 2500

  19. #44
    Join Date
    Jun 2005
    Location
    hazard,ky
    Posts
    5,871

    Default Re: piston opinions wanted

    Quote Originally Posted by telriv View Post
    As low as 8-1 for MAX boost.
    ill keep you in mind then when I get to that point.
    66 skylark 2 dr hartop...... in progression
    07 silverado 3500 hd 6.0
    12 kia sorento sx
    99 f150
    89 dodge spirit
    http://smg.photobucket.com/albums/v237/nekkidhillbilly/

 

 
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