So I snapped a timing belt and bent a couple valves and dented a few pistons so Im going to be doing rods and pistons shortly. Ill be running the Manley H-beam rods and some JE pistons. My question is, is that should I change the compression ratio and is there anything I can do with the crank to help it to rev other then just balancing it? Its for a track car but it wont really see much more then maybe a fp red and about 28-30psi on e85. I will have a pump gas map for if I ever get caught without e85 or race gas but I very rarely ever drive the car on the street so it would just be a limp mode kind of a map. Also the car will be on the stock ecu if that makes any difference what so ever.

 

Sorry, to hear that. I want to replace my rods and pistons, and want to still use the stock ecu also. '

Interested

 

good luck to ya

and what kind of driving will u be seeing drag/auto or just autocross guessing by your avatar its auto??

 

Ultimate-

Go with the Crower/JE setup because the Manley H-beam will need some machining to fit into the JE's. I personally researched all the possibilities, from JE, Eagle, etc. and the best fit for me ultimately came down to the least amount of machine work that is the most realiable, and that would be the Crower/JE combo. I run GT35R, HKS 280, RC 1000cc, ported intake mani, port matched head to mani, Manley dual valve springs and stainless valves, balance shaft eliminator, shep trans, exedy twin...all this on stock ecu LOL.

Dam thing purrrrrrrs...even on junk Cali 91 octane. Some race fuel and 30 plus lbs of boost and this should see some really good times.

 

Ill be using it for open track/time trials/time attack etc. I don't plan to run anything more then a Red and will be using E85 99% of the time. Since I'm sponsored by a company that's a Manley dealer I think Ill stay with their rods. I'm just wondering if there's anything else I could do to help out while I'm down there? Also what should I do for compression ratio? I'll
Most likely be running kelford cams with supertech singles and Ti retainers.

 

Do a 10:1CR

-E

 

10:1 is great..but your never going to run on pump gas again, 91 Oct will make sure of that. Best over all responce, but you will have to lower the boost alot. Should make good power.

9:1 would be better suited to run pump and race gas. you can run slightly lower boost to make the same power.

but there is nothing wrong with 8.8:1 Stock

Get the block MagnaFluxed (looking for cracks).Dipped/cleaned and deburred to promote better oil flow. The crank lightened a tad, Balanced/Blueprinted and a mild Knife edge. Some might suggest Shotpeening and or Cryo the Crank also. how about asking to get the crankshaft index ground, micropolished and oil holes chamfered. Hell with enough money skys the limit.

 

Come to think of it....some Engines already come with the Crank Shotpeened. Im not 100% sure that The Evo crank is...since in its stock form it can take quite a bit of abuse, i wouldnt be supprized if it already is.

 

If I ran on 91oct it would be only because I needed to take the car to work or something and I wouldn't be putting any boost to it. As for the CR, what's more friendly, high boost and low CR or low boost and high CR? Like what creates more heat and strain on the motor and such? What I'm thinking is that with E85 I might be better off doing a higher CR that way Im only running say 24-26psi instead of 28-30psi since a small turbo like a green or even a red is going to start to just blow hot air up there. ?

 

Well the higher CR will give you alot more responce, slightly better Spool. Yes you will need less boost to make power.

The down side i have seen with High CR Boost engines is its life span. Even out of boost the engine works hard...plus your Knock threshold is that much smaller.

Sorry to say that there is not alot of information out there when it comes to picking the perfect CR.

I myself was going to raise mine to improve my transient response..i was thinking around 9:1 or 9.25:1 so i can still run pump (91 oct).

Maybe be good if you get like 9.5:1. Should still be a good compromise...because even E85 is not 100% consistent.