I have always wondered why no one made a high rise intake with dual quads... i always thought they looked cool. I have a sbc with a high rise and dual quads and it screams. So, after quite a few years, i decided to make one. I have a program I made the intake runners for, and the box top, bottom and sides... Will be showing pics soon...
Cool. Do you have any other info...? Cost, lead time? Estimated quantity of production run? A build paradigm including effective rpm range, CSA, flow #'s, plenum size %'s? Which wave reflection #'s or formulas based on , intended power levels, intake port requirements? What are all those #'s based on the common cubic inch sizes? I'm sure there are lots more questions, inquiring minds want to know
I believe a lack of market would be the original answer (same reason there aren't any aluminum heads, bolt on supercharger kits, etc.). If you've made one, that's awesome! Please post pics and hopefully some dyno results.
the nailhead lacks the high rpm capability to make good use of a high rise intake. the heads dont flow well enough.
I love the tunnel ram look, bad sadly very hard to legally run one on the street here in Oz due to height out the bonnet. I had one all set to go on my BBC, but legalities canned that
Yessir, agreed, when the engine is properly built for a tunnel ram, there is no better naturally aspirated set-up. Their bad reputation comes from guys sticking them on engines that are much too mild and people that have no business tuning one carb, let alone a pair.
When it comes to the high rise actually making power? well sometimes....... the look is what I really want.. It's a nailhead, people like what they see either way! I have 5 water jet programs to make this little test goodie. I had bought some flame cut intake and exhaust flanges from Hell's gate hot rods out of Idaho, but the holes were eh, ok on one side, but they were really poorly cut on the other side. The plasma or torch tips were worn out, so not only did I have to open up the holes to accommodate the bolts on one side, but the other side was so blown open, they were really bad and not usable. So, I made my own plasma cad drawings and they are at the water jetters as we speak. A little expensive at $25 per flange plus material, but I spent nearly $100 for unusable flanges. These will be awesome... if anyone possibly would like some, let me know.. email me at gbemandrel@gmail.com. They will be made of 3/8" mild steel or stainless if I want too.. The intake will be made of 3/8" mild intake plates and the top box will be made of 1/8" mild steel...
Oh, and when it comes to torque, I think my nailhead is doing just fine... These are torque monsters anyways! And yes, I am talking about a high rise tunnel ram!
Hey Steve, good to see you back on the forum. I need to swing by so you can see where I am with the Cat, and also still want/need to get that rear seat from you.
I built a sheetmetal prototype about 10years ago and tested it on our dragster. it was a disaster from a performance standpoint. The torque loss was dramatic.
Curious what sizing you used and how it mathed out to the combo...or was there some kind of flow or distribution issue? I would say the end results were 100% within your control.
Heads cant handle that much naturally aspirated flow. I know when to cut my losses, I cut the intake down, welded on a blower plate and "Bob's your uncle!" I opened up the heads by filling the water jackets with aluminum and ran alchohol to cool it. if you're doing it because you like the looks. Then it doesn't matter. I was making 800+ hp. Good Luck Steve, It was nice to see you last month.
I was hoping for a more detailed explanation than 'heads can't handle that much naturally aspirated flow'...for the forum to benefit from. What were those heads flowing? What minimum CSA were you working with in the heads? What was intended peak torque rpm, cam specs, installed centerline, overall build specs, and target hp rpm? What were the dimensions the T ram, runner length, diameter, plenum size, amount of runner taper? Knowing the limitations of the Nailhead, what strategies were thought of to compliment? Which formulas did you base the dimensions from? sbc's that used tunnel rams with the 60's and 70's heads have similar head flow#'s to a decent ported Nailhead. Please don't take this as negative criticism, I'm actually helping you out here, free of charge. I skimmed the other thread, glad you are alive! You are a benefit to the hobby/community for sure!
Makes sense. Sounds like too large of a runner diameter and maybe didn't get effective use of cam overlap working. Those pesky time consuming R&D things
Agreed. We love the Nailhead, but the last one was built more then a half-century ago. There isn't going to be a lot of stuff made for an engine that has been out of production for that long.
