[PatScottAKA99XE]

Any one know, are they still gonna do it?

 

[Adam]

From what I remember talking to mike on the mailing list, it's not a product they're going to have in stock, it's more of a first come first served thing. You call up and ask for them and they go out to this other company to have them made for you. At least that's what I remember.

 

[motivational1]

The rod deal is not going to happen. I ended up in a lawsuit with the guy building the rods. The pistons take about 3-4 weeks to be built. They are already designed and ready for production. They cost $500 for the pistons,rings and wrist pins.

Moitvational Engineering

 

[Adam]

The rod deal is not going to happen. I ended up in a lawsuit with the guy building the rods. The pistons take about 3-4 weeks to be built. They are already designed and ready for production. They cost $500 for the pistons,rings and wrist pins.

Moitvational Engineering

So can we get a higher CR on those?

 

[motivational1]

We have either an 11:1 or 8.5:1 available.

Motivational Engineering

 

[Adam]

So I don't know if you have the answer I'm looking for, but I've been trying to figure out what kind of power gains you can receive from the 11:1 pistons? Even if it's not GA16 specific, what is average for a small motor going from 9.5 to 11?? Any ideas?

 

[motivational1]

I think that you would see 5-10 horsepower. Maybe someone else might have some real numbers. I've heard that a V8 can get 30 horsepower per point of compression, for example 10:1 to 11:1.etc....

 

[PatScottAKA99XE]

Nice to see you here Mike S.

Thats too bad about the rod deal, I have found some other possible sorces so I guess I am all set with that. About the pistions, can you give us some specs/info. For example If I wanted to have pistons coated by Swain Tech will you offer the proper diameter piston to acount for the thickness of the coating, or would I be better off handing that with bore size?

 

[motivational1]

We would need to know the exact bore size you are using and how much smaller you'd like the piston to be for the coating. How thick is the swain coating?

Motivational Engineering

 

[Ninety-Nine SE-L]

is the swain coating a good idea? internal work is new to me. also, since I'm asking questions, what's the difference between 11:1 and 8.5:1?

 

[James]

2.5....

j/k... what do you mean what's the difference?

 

[Ninety-Nine SE-L]

like what's better, what changes in the engine, that kinda stuff.

 

[James]

11 is for ppl trying to crank power out of a NA engine but is way too high for turbo engines. lowering the compression increases the volume of the combustion chamber at the point of the fuel/air ignition...

 

[Ninety-Nine SE-L]

So I'm guessing If I wanted to go turbo, I would want to go 8.5? what's stock compression? also, I might end up getting an SR20DET in the future, I realize that there's probably a sh*t load of products for that engine as compared to mine. what do you recommend I do to the internals of that engine?

I have alot of reading up to do, so some info here wouldn't hurt.

 

[James]

as for the sr20det I suggest you do more reading, there's more info than I have time to give you...

but yes 8.5 for a turbo engine... stock is 9.5 (unless you screwed with the timing which effectively changes the compression a bit)

 

[barnoun]

...stock is 9.5 (unless you screwed with the timing which effectively changes the compression a bit)

You mean it would raise the compression?

 

[James]

yeah slightly.

 

[barnoun]

Guess us adv. timing guys have higher compression

 

[PatScottAKA99XE]

In truth us adv. timing guys do NOT have increased compression ratio. You can not change compression ratio with out doin internal work to the motor ie. crank,rods,pistons,head. What us adv. timming guys have is higher cylinder pressuresor higher compression pressures. If you do a compression check before and after changing your timming you will get the same numbers(psi). The only time the psi changes(after timming adj.) is with the engine running. The whole point of advancing your timming is to start the "fire" sooner in the cyl. to increase the amount of psi that the "fire" or "burn" give you. This increased psi is what gives you the extra hp. Compression ratio is the difference between cyl. volume with the piston at BDC and the cyl. volume with the piston at TDC. There is no way timing can effect the formula for compresion ratio.

 

[javierb14]

what kind of material are the pistons and pins going to made out of? forged?

thanks

javier
www.maxrev.com