Dyno results 470 street engine

I have found that increasing lift while keeping the dur. @ .050" relatively mild helps to raise the power level in an engine while giving quite good fuel economy @ cruise speeds.

Heads that will max out CFM flow at say .500" lift with a cam that has .550" lift would hit that max cfm flow twice, well actually hit the max flow and stay there just because the lift went over where the max flow is doesn't mean the flow stops, it actually still flows around the same as where it maxed out. Utilizing more lift this way helps to fill the cylinder more efficiently @ WOT while still being quite tame at lower RPM levels that will actually raise the torque at lower RPMs.

Of coarse to do something like mentioned above is way easier using a roller cam than a flat tappet cam. Ramp rates can be much more aggressive without the risk of wiping a cam out. So there is one way to help increase mpg, the next way with a setup like this would be gearing.

Not saying this is the only way it can be done, but is one way that I have used that worked for me. Although with 72 less cid than a 455, but the car weighs around 4,400 lbs without my 225 lb fat but in it(LOL) so is probably still valid. Keep getting monetarily blocked to complete the Buick builds I want to do for myself! But I'm not dead yet so there is still time to get those done as long as I don't meet with an unexpected untimely demise I should eventually be able to get them done?



Derek

 

Did you already wear out your engine and are looking to replace yours? :grin::grin::grin::grin:

 

??????????

 

I was responding to Larry, not you Derek.
I double clicked the 'submit reply', so it hadn't shown me your comment yet.
I'm going to read it now, thank you.

 

I'll back Derek's post 100%.
Much of what helps power by virtue of more efficient use of combustion or induction velocity will help part throttle economy.
That's why I commented on this particular thread when the question came up.

 

I don't think any of the current GM supercharged LSa/LS9 offerings knock off 25mph highway with modern computer everything and 8 speed overdrive trannys

 

You can be sure of that Larry...:Brow:

 

I guess I should have came back here to check this forum sooner!

I didn't mean for it to come off as negative, so apologies to all if it seemed that way. I'm not certain how it could have been construed as such. You seem very sensitive to simple observations and opinions about this sort of thing for some reason.

My comments were more along the lines in a response to the fuel consumption of such engines, and how things were measured in order to maximize the numbers, and how it's done everywhere in all sorts of industries (I gave computer hard drives as an example). This isn't to imply that things are magic, lucky, or fabricated, and certainly isn't bashing anyone's hard work or skills. Not sure how my post gave that impression.

It was a generalized 'engines such as these', and not 'yours' or 'Chris's' specifically, so there's no bashing going on here. I even commented earlier in this thread about how impressive it was and congratulated him on the great work (I think it was this thread--maybe it was the other one? or both?) I even commented on how inspired I was. How does all this add up to negativity?

Thank you for the compliments, but I find your interpretation of my post filled with unnecessary contempt and condescension.

It's as if you took this whole thing personal because it hits a little too close to home. Am I not permitted to have an opinion without it getting scrutinized and embellished with imagined insults?

I'm not trying to start a debate or argument (though you certainly breathe down my neck on nearly every post I make lol), just wanted to make some comments in regards to your fuel consumption statements.

Kitty's got claws!

Maybe I should just stay out of these types of conversations. It only causes problems.

 

I certainly didn't take anything personal, but I did interpret (maybe mistakenly) some negativity pertaining to Chris' engine and it's streetability.
Just as "kitty's got claws" could possibly get you punched in public...can't see how that wouldn't be taken offensively (??), lol.
("but geeez, I didn't mean it like thaaat... ")
It takes a bit more than that to offend me, lol.
Not sure the point of bringing up the computer info, other than to suggest that pointing out the example of time on road being factored is trickery designed to fool the consumer, or sway the facts. It is a legit consideration and given some pages in the MIT derived textbooks.

Everyone's comments and opinions are valuable!
If it reads like I'm overreacting, my apologies!

It's definitely tough not to want to split hairs over the replies to my comments on mileage.
I'm stating what is achievable, and am pointing to how one might learn more about that. Reasonable? Generous even?
I'm addressing the question asked within the thread, that's it.
To use an example from the profession of metal fab and body work;
"Imagine my shock when I first heard about being able to shrink dented sheet metal".
Noooo waaaayy! But I've been smashing cars for 30 years! ( just kidding, nothing insulting meant by that :grin::grin: )
Just like if I were to read about it and even try a couple of times, attempting to converse negatively with professionals would more or less show exactly where I was at.

Not to seem political or conspiracy theorist but my own learning curve with various technologies always led me to shift my questions from the technical end towards more corporate and political ones.

Geeez! All I wanted to do was state that this well thought out and sorted engine could do better than some expect... p

 

Also consider you are likely trying to get 25+ MPG out of a vehicle with the aerodynamics of a cinder block on fat tires setup for straight line traction.

 

You guys might want to start your own super mileage thread, your mucking up Chris's dyno thread.

Motor looks nice Chris, more cam that I would use in a street car, but results are good.

JW

 

The car itself is the biggest determiner or limitation.
Some of my previous work was in Trans Ams, some others were in 2 door full size.

 

I believe Sean was being a little bit on the sarcastic side, based on past comments made elsewhere on this subject, though I could be mistaken.

I never even disagreed that 25 mpg could be achieved, only offered up a very summarized way in which it could. I don't want to step on any toes or accidentally give away top secret information, or I might start hearing helicopters flying overhead. lol

I have to be a bit more gentle in my presentation I guess (as usual), because of my abilities that took others decades to learn. (not bragging, and I cringe having to bring that part up now, but it's true)

I said what I needed to say and I'm going to leave well enough alone.

I have nothing against anyone here, nor their fine work, and do not wish to continue mucking up Chris's thread.

Peace everyone!

Oh and Happy Holidays! Have fun, enjoy yourselves, and above all be safe.

 

I read it as sarcasm as well, but couldn't resist the temptation.

 

Nice work Chris!