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Cross Fire engine build.. Opinions on whats to come. Profiler 195cc heads 10.25:1 static compression Forged flat tops and rods Comp xm276hr retrofit roller Dynamic compression around 8:1 depending on calculator used. 93 octane Quench will be set around .045 Ebl flash Long tubes into 2.5 true duals with an x pipe at another time. Cant empty the bank account all at once. Probably in the spring. Whats everybodys opinion? |
Re: Cross Fire engine build.. Opinions on whats to come.
Originally Posted by brianlibby791
(Post 6263638)
Forged flat tops and rods Quench will be set around .045 Quench at .045 is at the very top of the acceptable range. "I" would look at .035 to .040 depending on piston rock. Engine I'm building now is zero-decked or very close, and a .039 gasket pair. I probably should have left the piston .005--.010 in the hole (less material cut from the deck) and used .029 gaskets. |
Re: Cross Fire engine build.. Opinions on whats to come.
Originally Posted by Schurkey
(Post 6263692)
"Flat Tops" means NOTHING until you start specifying compression distance. It's REALLY easy to get pistons that sit too low in the cylinder, and then require excess milling of the block decks to get the quench distance right. Quench at .045 is at the very top of the acceptable range. "I" would look at .035 to .040 depending on piston rock. Engine I'm building now is zero-decked or very close, and a .039 gasket pair. I probably should have left the piston .005--.010 in the hole (less material cut from the deck) and used .029 gaskets. |
Re: Cross Fire engine build.. Opinions on whats to come.
Originally Posted by brianlibby791
(Post 6264378)
Right now they're at roughly the stock depth in the block, (.025) Obviously when the heads come off I'll actually measure the volume exactly and adjust accordingly but using everyone else's findings that's about the height it should be at.... It's a healthy rotating assembly, no sense messing with it at this point. Good compression, no ring blow by. Honestly I thought quench was a .04-.05 target but that's why I asked. I'm by no means an expert on this. |
Re: Cross Fire engine build.. Opinions on whats to come. The stock TBs and Crossfire intake will be restrictions. I would go with an aftermarket Renegade intake. You need to have the stock TBs bored out, but I don't know anyone that does it anymore. After that, its all about fuel delivery and getting enough fuel into the engine. At a minimum, you need to upgrade to Vette injectors and will likely need to bump fuel pressure up as well. I'm close to maxing out the fuel system with nothing near as radical as you have. See build specs below. |
Re: Cross Fire engine build.. Opinions on whats to come. Forgot to mention, fuel pressure currently set at 18 PSI. I've heard you can go as high as the mid 20s, but I don't need that much with what I currently have. |
Re: Cross Fire engine build.. Opinions on whats to come.
Originally Posted by gheatly
(Post 6276700)
The stock TBs and Crossfire intake will be restrictions. I would go with an aftermarket Renegade intake. You need to have the stock TBs bored out, but I don't know anyone that does it anymore. After that, its all about fuel delivery and getting enough fuel into the engine. At a minimum, you need to upgrade to Vette injectors and will likely need to bump fuel pressure up as well. I'm close to maxing out the fuel system with nothing near as radical as you have. See build specs below. |
Re: Cross Fire engine build.. Opinions on whats to come. It's amazing how time changes things. This was the original "idea" for my current build. Granted the idea was the same, the parts combination changed a lot. My cousin (Brian) put out the feeler for it as I did with a few friends in the business more just to see if I was even picking decent parts more so than if it would work I guess. Anyway, I left the short block alone, pistons CC at roughly 6... It is difficult to CC a piston in a block, I did some math with playdough and got a pretty consistent result though... Pistons measured about .02 in the hole and I went with a thin... .02 head gasket if memory serves... Had all the math written down at some point but I get the compression at about 10.1:1 using the volume I measured in the head's chamber. Cam ended up in the 226/231 range with a .509/.517 valve lift. Straight dual 3 inch exhaust with a single X to 2.25 right at the tips... not ideal but it does work fine... sounds fantastic though. I have a renegade but due to core shift it doesn't seal the lifter valley and pulls vacuum from the crankcase and does all sorts of weird things... I have a set of 2inch throttle bodies sitting on the bench I purchased for the cost of a single max bore plus shipping so that was cool. And I now have a few spares to play around with too. I have a ported to all hell stock intake that was worked on with a flow bench that flows pretty damn well for what the current mill will need and eventually I will try and hack the renegade together for the next one. It flows pretty close to the renegade. It will not make the same power for sure but it should be nice for a mild 350. So the car runs great, drives as good as stock, sounds amazing, and even with the stock intake manifold pulls to 6200... stops making power around 4000 rpms though. (was hoping to get a new renegade so the stock untouched one went on temporarily for the last 2 years...) Figured a conclusion to the original question was due. It is fun. |
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