429idi
Full Access Member
Dude go for it. I think it can be done. We just have to push the threshold...
You'll probably finish your blower before mine, but I'm working on it.
Dude go for it. I think it can be done. We just have to push the threshold...
Sounds fun.. kinda lol Have you done anything to drop the compression? This is my other hidden idea about running a blower, theoretically in my mind that would allow running even lower than "lower" static compression. Say the blower is boosting 2-3lbs at idle. That would make a 17-1 engine more like 18-1 at idle... if ya get me, then again at this point im not sure that i get myself, but im havin fun. With a blower that is going to boost no matter what, you could drop the CR waaay down, fuel like crazy, and light that big ol' nasty turbo you have. Set the propane to come in with the turbo, and i dont see 40lbs as a problem. So long as you have the fuel to make it all happen.
Sounds fun.. kinda lol Have you done anything to drop the compression? This is my other hidden idea about running a blower, theoretically in my mind that would allow running even lower than "lower" static compression. Say the blower is boosting 2-3lbs at idle. That would make a 17-1 engine more like 18-1 at idle... if ya get me, then again at this point im not sure that i get myself, but im havin fun. With a blower that is going to boost no matter what, you could drop the CR waaay down, fuel like crazy, and light that big ol' nasty turbo you have. Set the propane to come in with the turbo, and i dont see 40lbs as a problem. So long as you have the fuel to make it all happen.
I never thought of that, did the 5.7s run the stanadyne pumps? I dont think id want 4400 either, but i get your point. Ive been talking to a local engine builder that does alot of race motors around here, going to have him do some lightening, balancing, knife the crank, and maybe bore it. He said he can tell me what he thinks will be safe rpm wise after tearing into it, so im going to go mostly off of that. I have heard of people running them in stock form at 4k and even 4500. So maybe after surgery 4400 will be fine. Like you said, just because it will go that high doesnt mean i have to... but i will . Which means ill have to get a new tachI'm getting some 4400rpm springs from a 5.7 chev idi. Not because I want to turn 4400rpm, but because it appears that it won't start cutting off my fuel before I want it to.
That is a good point, it could get rid of the hard starting issues that lower compression engines have.
I never thought of that, did the 5.7s run the stanadyne pumps? I dont think id want 4400 either, but i get your point. Ive been talking to a local engine builder that does alot of race motors around here, going to have him do some lightening, balancing, knife the crank, and maybe bore it. He said he can tell me what he thinks will be safe rpm wise after tearing into it, so im going to go mostly off of that. I have heard of people running them in stock form at 4k and even 4500. So maybe after surgery 4400 will be fine. Like you said, just because it will go that high doesnt mean i have to... but i will . Which means ill have to get a new tach
That is a good point, it could get rid of the hard starting issues that lower compression engines have.
I think you would still have a hard time starting it. Idk just my opinion.
I never thought of that, did the 5.7s run the stanadyne pumps? I dont think id want 4400 either, but i get your point. Ive been talking to a local engine builder that does alot of race motors around here, going to have him do some lightening, balancing, knife the crank, and maybe bore it. He said he can tell me what he thinks will be safe rpm wise after tearing into it, so im going to go mostly off of that. I have heard of people running them in stock form at 4k and even 4500. So maybe after surgery 4400 will be fine. Like you said, just because it will go that high doesnt mean i have to... but i will . Which means ill have to get a new tach
I think you would still have a hard time starting it. Idk just my opinion.
Oh yes stiffer springs will be mandatory to go that high im sure, if not due to just boost alone. Not to mention i want to use a exhaust brake. Was going to use the same springs NMB2 anr Racin are using, they have good numbers installed, even have room to shim, or go with a 1.7 rocker before bind. As far as boring goes, it would be only to clean up the block and get everything aligned so .030 or .040 at most. Im going to run a pre-charged coolant filter so even if i did bore it out to a 7.3 or higher cavitation wont be an issue.I'd be careful with boring it too far cus of cavitation issues. Idk how far is safe though. You could also run a stiffer PSD spring too.
Ya they run the db2, there was a pump on ebay that I was watching, and the auction ended while I was at work, it sold for 5.00
That bites, i wonder how different they are from ours if they are at all.
Ya, the volumetric efficiency is pretty low at low rpm, but if you aren't using the idle bypass it could make some boost.
By the way, It would only take 1psi to make 17:1 static turn into 18:1.
14.7+1=15.7 /14.7=1.068 x 17 = 18.15
Wow, nice work i knew there had to be a formula, but i had no idea what it was. Soo 14.7+40= 54.7/14.7=3.72x17= 63.24 ? Then again, thats at sea level, i think average air elevation around here in the summer is around 4200... like 12.4 AP. Been a while since i played with our airtronics thingy
ive got a line on a 7.3 factory block and heads. plan: bore 7.3 to accommodate sleeves, actually reducin the bore from 4.11 to 4.10. get a fully balanced 4.36 inch stroker rotatin assy. with ceramic coated, low-topped pistons, with DEEP valve reliefs, makin it a non-interference motor, even with with a big, 460-torque-monster inspired hydro-roller cam, gettin .550"/.500" intake/exhaust lift, respectively. this would make it a spot-on-the-nose 460ci motor, with a compression goal of 18:1. '94 moose pump with torque screw, 4400rpm spring, and moose misters, extensive head work with studs, custom intake with water/**** injection, to perch a 6 or 8-71 (or maybe an 8-92??) blower on top of, pushin 9 psi at idle, and a set of stans headers with true dual exhaust. goal: i only want to push a measly 350 hp and 550 lb-ft. if i can hit that, ill be happy. but im sure youve noticed, the cam is the weak link im aimin to solve, and if a gm lsx 454 gasser with an 8-71 at 9 psi can push 850 lb-ft at idle, so can my motha-f***in IDI!!