BenR i agree with you im just wondering what allebnheathdj is thinking is going to be so hard to do

 

It would be interesting to see what the flow numbers are for a stock head. Once you know that, I think you can add in numbers for the valve lift and duration and determine how much volume the head will flow. Then you can measure your displacement multiplied by the rpm and figure out the "needs" of the new bottom end. I know I'm making it sound too simple, but it can be done and you can at least get a good idea if the stock head will be restrictive, and a fair idea of how restrictive.

 

Flow figures are available, with valve lifts (factoring them in is too hard compared to just measuring it).

The most extensive testing done by Alaniz on a relatively small flowbench (not a bad thing) at a low pressure drop (again not a bad thing) prooved that a full lift the head is pretty much 'non restrictive' where the SF110 can flow about 180cfm, and the head managed that a peak flow figures.

At a rough estimate, you theoretically wouldnt need to play too hard on the head with the std valve sizes till closer to 300bhp.

Personally, i would jsut whip on the bottom end. More torque, same (ish) peak power.

 

good luck. can't wait to see the end result

 

Not necessarily!

If the rods have changed sizes (stroker) then their will be more pressure against the sidewalls of the cylinder as the piston moves up and down. The best case is to have the pistons push the rods down in a "square" angle to the crank. If you go off square, you create more friction, more heat, and potentially issues with the engine. I think this is what everone is concerned about when they mention "how long will the engine last".

He has mention that he is getting all new internals. As long as the geometry is square, he will be OK, in this respect. I too was quoted that 2.5 was the largest this engine can be bored and stroked. I just did not have the balls to go forward with it, too risky for my blood. And since I am hearing that you do not have EXTRA money for EMS, I would suggest that it might be too risky for yours. Good luck!!

 

The stroker kit uses longer rods does it not?

So if anybody can give me the size of the rod then we can compare teh rod/stroke ratio and see if it is actualyl going to get higher side loadings and a higher rod angle.

 

Hard to say. Depends on what they did with the crank (or can do), but typically they are shorter. That way the piston comes down the cylinder longer creating more volume. If you made them longer and did not change the crank, then the pistons would bump into the head. A good way to bend some valve stems!

 

tims02, if you read my first post i mentioned that the crank is new along with the rods, the guys at inline have been building race motors for a long time, that being said they have planed this all out and they are confident it will work. The reason they are installing the first kit in my car is because they already bought one s2000 for their turbo kit and they didnt feel like buying another, becasue they need to buy other project cars. believe me that the pistons will not be bumping into the head. As for my moeny issue i dont have the "extra" money at this time for the EMS. This car will also serve as a really good baseline for waht this kit can do,as this will be the minimum cost set up you could potentially run. more or less any one who buys this kit will put out the same numbers i will. Also this car is far from over after this

 

OK so here's a question for you. So how well do you know the guys at inline. The reason why I ask is that, because you are the first, problems will come up that no one expects(anyone who has prototyped anything will attest to this). No matter how long they've been doing engines, they've never done this before to an F20C. Have you sat down and talked to them about how much they plan to warrent their work(if any). Not saying they're not stand up guys, just want to know if you've talked to them about what's going to happen if problems arise. Because they do happen and we want to make sure you're covered.

Again good luck and post those dyno's once you get them

 

[QUOTE]Originally posted by tms02
Hard to say.