I want to be boosting around 10-12 psi(how much hp will this yield?) and I want to run decent times at the track, 11-12’s.
Now to the current state of the engine. The engine is in decent shape OTHER than the fact that the crankshaft is stripped out where the pulleys attach(that bolt). I am going to be taking the bottom end apart to fix this and I figured I’d get the bottom end boost ready while its apart. What parts do you guys reccomend that I use for this rebuild? I have a friend that runs a performance shop in the area so stuff will come in pretty cheap and the labor will be done by us.
Ok, I went to the local shop and was talking to a friend there. He gave me a few part names and I wanted to see what everyone here thought.
The parts I need:
SRP or JE Pistons (he said these were basicly the same kind) w/a compression of 9:1
JE Rings
Eagle or Crower Rods
Crower Valve Springs and Titanium Retainers
OEM Gaskets
OEM B18a Crankshaft
From what I have read Eagle makes good products. How is the compression, is 9:1 too low? I am going to be driving around on all this for a few months until I get the turbo pieced together and in. Will my car be slow as hell until then w/such a low compression?
8.5:1 and 9:1 are good compressions for boost. My stock 1g talon is 7.8:1!! Lots of boost. Anyways… yes, your car is gonna be ass slow with lower compression pistons in your motor without the turbo. That parts list sounds pretty good, but why not get your cranked fully balanced and knife edged before you throw it back in? To run 11s you’re going to need about 350-400hp and some really really sticky tires (not to mention an LSD). At that level, you have to worry about other stuff then your motor, like axles, trannys, ya know, driveline stuff.
EDIT: Make sure to use ARP hardware. Very high quality.
knife edging is done to lighten the crank. They take weight off of the counter weights taking the most material off of the ends of the weights and less the further they move towards the journals. The result is a knife like look. One disadvantage is that it weakens the crank.
In my opinion it is not neccesary on a honda crank. Balancing is all that is needed.
also, on a honda, the counterweights are there to keep the recriprocating assembly (rods, pistons, crank) balanced in relation to one another. it is not a good idea to lighten it.
as for compression ratio, many people have had good luck with high compression & turbo in a honda motor. if you plan somewhere along the line to get programmable engine management then look into a ratio of 10:1 or at least 9.5:1. this will give you great lowend off-boost pull & helps to spool the turbo sooner. downsides are a smaller margin for error when tuning, hence the recommendation for programmable engine management.
If knife edging equals weakening the crankshaft then there is NO WAY I will be doing this to the piece going into my bottom end. I am rebuiling it for added strength and sturdiness for the boost.
I’d like to go with a higher cr on my next turbo motor…maybe as high as 11:1 :shock: should be a kick…would be good with a small turbo that spools quick…road racing motor?