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| fastleno |
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will a balanced standard AU I6 bottom end put up with 7500rpm and 10:1 compression ratio ?
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| Molloy |
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How long do you plan on keeping it at 7500rpm?
_________________ SS Inductions CAI, K&N Filters, M-spec FMC, Turbosmart BOV, 8psi capa tune, X-force cat. |
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| fastleno |
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its for speedway, it will only peak near the end of the straights for about 4 seconds every 5 seconds
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| ebfairmont3.9 |
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Give it a go dude... i know the top end would have no chance lol (springs)
The bottom as far as i know can take 6500 all day 7500 will be a challenge 
_________________ 1994 ED Fairmont Champaign Gold - AU Series II Intech 4.0L - EL EFI - Thermo Fans - 4.11 LSD - Pacemaker 4480 Into Custom 3" Exhaust - Shift Kit |
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| aaron_hogan |
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dry sump it otherwise it'll starve for oil.
what other mods do you plan for?
_________________ EA SVO Fairmont Ghia - Recaros, Bilsteins, Sunroof, SVO rims and body kit, Genie headers, DBA rotors. T5 steeda triax short shifter. 3.27 lsd. (EL 4.0 ported/polished, rebuilt and balanced, Dev5 cam. J3 chipped EL ecu, AU injectors). |
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| cjh |
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7500 rpm is a big ask for a stock bottom end. What would be the piston speed at that???? more than what stock pistons could handle. Don't if the std rods would handle that rpm either. Would need a really good balance too.
_________________ http://youtu.be/jJTh9F3Vgg0 |
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| fastleno |
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i was thinking of dry sumping it, the cam's rpm range is 4000-8000 using adjustable solid rockers and all the usual head work, 390 4bbl holley, EDIS with megajolt, pro timing set, vernier gear ect, i was hoping to get away with just a balance on the bottom end, i might have to work out the piston travel/speed ans see what i work out. last seasons X-flow i built revved well into the sixes and still wanted to pull, the bottom end was basically standard. looks like more researching i want to get stuck into it ASAP.
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
the crank will be fine. but the rods will let go very fast.
do the rules let you change internal components? if so any of the good XR6T rods will go that far. the atomic skinny rods have been proven at the rpm and most others should do it too. you'd also need to look at running a looser bearing clearneces. your biggest problem is going to the cam drive setup. |
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| fastleno |
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its opens mate i can run what ever i like hence the reason for wanting a motor that goes super hard, what probs will i have with the cam drive set up ?
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| smiley235 |
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fastleno wrote: i was thinking of dry sumping it, the cam's rpm range is 4000-8000 using adjustable solid rockers and all the usual head work, 390 4bbl holley, EDIS with megajolt, pro timing set, vernier gear ect, i was hoping to get away with just a balance on the bottom end, i might have to work out the piston travel/speed ans see what i work out. last seasons X-flow i built revved well into the sixes and still wanted to pull, the bottom end was basically standard. looks like more researching i want to get stuck into it ASAP.
well if the car is for track only, not only would dry sumping it be a good safety measure but there are significant power advantages too.
_________________ 178.3 rwkw
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
fastleno wrote: its opens mate i can run what ever i like hence the reason for wanting a motor that goes super hard, what probs will i have with the cam drive set up ?
you find find keeping the guides in one peice will be the problem, the length of chain, the lift of the cam and pressure of the valve springs and high rpm will put alot stress on the guides and chain |
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| fastleno |
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thats why thay make performance chains mate, i dont really see that as a problem. i am more concerned about the cam dowel shearing.
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| Private9 |
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Personally I'd give it a go. If you can do removal/reinstall yourself, another bottom end with only cost you a few hundred from the wreckers.
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
fastleno wrote: thats why thay make performance chains mate, i dont really see that as a problem. i am more concerned about the cam dowel shearing.
it's not the chain you shoud be worried about. it's the chain guides that will be the problem |
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| Slick |
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every component in the engine can be treated & harden. theres a extra 500 or so RPM gain from a lighten flywheel, another 800 or more safe RPM gain from a full balance on the bottom end.
_________________ Mind f**k!!! it works on feeble minded ignorant sheeples... there's plenty of em on this site... some are very intelligent but by god they are so thick!!! Pakrat wrote: You can buy them seppertly
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