stroker kits on this engine are a waste (save the Toda thread)

[D K]

Originally Posted by Sammakko

back in the day, timing CHAIN vehicles

By highlghting chain, are you referring to the fa20 as a timing belt engine?

[Sammakko]

Originally Posted by HaDDeS

there is no reason to worry about the head gasket.

it seemed super important a few posts back.. i.e.. different cams per head gasket change..

[Sammakko]

Originally Posted by D K

By highlghting chain, are you referring to the fa20 as a timing belt engine?

no. i'm referring to many engines in the past who still used a chain..


chains have very low resolution, accuracy-wise. less room for adjustment in length vs belts. belts can be more accurate because there are fewer teeth per inch, per say. there are some very reliable chain engines, but they're being phased out.

[Sammakko]

Originally Posted by HaDDeS

Tweak means what it means

[stugray]

Originally Posted by D K

So you dont care that you are advancing the cam timing on one side and retarding it on the other side?

A quick back of napkin SWAG says that the difference between a .5mm & 1mm head gasket is less than half a degree per cam gear.

Do you honestly think these cams are capable of controlling to within less than 1 degree when under VVT control?

And if your answer is yes, then wouldnt the VVT system compensate for it anyway without tuning??

[D K]

Originally Posted by Sammakko

no. i'm referring to many engines in the past who still used a chain..


chains have very low resolution, accuracy-wise. less room for adjustment in length vs belts. belts can be more accurate because there are fewer teeth per inch, per say. there are some very reliable chain engines, but they're being phased out.

This is another point missed....



It has nothing to do with accuracy or resolution.

Do you know what happens when you have 2 heads 180 degrees from eachother and you bring them closer to the crankshaft with a fixed length chain?????

Go ask a qualified Porsche race technician and tell them you have this bright idea of changing headgsket thickness.....



Let me know what he says lol

[Captain Snooze]

From the home page of this forum there are, at this point in time, 5,149 threads in the Engine,Exhaust,Transmission thread. The next most popular section is Cosmetic Modification with 5,037 threads. Cosmetics ffs!!! I'd better get over there and tell all those people they are wasting their time and money.

[Sammakko]

Originally Posted by Captain Snooze

From the home page of this forum there are, at this point in time, 5,149 threads in the Engine,Exhaust,Transmission thread. The next most popular section is Cosmetic Modification with 5,037 threads. Cosmetics ffs!!! I'd better get over there and tell all those people they are wasting their time and money.

so many hairdressers! my 40 yr old aunt went to school for cosmetology.


she's a dentist now.

go>show

[Captain Snooze]

Originally Posted by Sammakko

go>show

Not for a lot of people it would seem.

[D K]

Originally Posted by stugray

A quick back of napkin SWAG says that the difference between a .5mm & 1mm head gasket is less than half a degree per cam gear.

I havent dne the math but I think its a little bit more.

Originally Posted by stugray

Do you honestly think these cams are capable of controlling to within less than 1 degree when under VVT control?

This sentance makes 0 sense.

But if you are asking whether or not the VVT can control the cams within 1 degree of crank timing, then the answer is yes.

Originally Posted by stugray

wouldn't VVT system compensate for it anyway without tuning??

Are you serious????

Or just playing?

[stugray]

Originally Posted by D K

This sentance makes 0 sense.

But if you are asking whether or not the VVT can control the cams within 1 degree of crank timing, then the answer is yes.

Yes - the ECU has a target cam angle. The control system tries to keep the angle as close to the target as possible. Does this system typically run within 1 degree of target cam phase angle?

Originally Posted by D K

Are you serious????

Or just playing?

Quite serious. The cam sensor senses the controlled side of the cam (opposite side from cam gear). The side that floats.
The control system modulates the system to move floating side of the cam to the target angle.
If you believe that the system can control to within 1 degree than it clearly can remove one degree of difference between the two cams just as it will compensate for (slightly) stretched chains.

And back on topic:

Increasing the engine stroke not only gives more torque due to increased displacement, but it also increases the lever arm length of the rod pushing on the crank.
So there is another factor that increases overall hp by stroking.
There is yet another factor of increased maximum piston velocity (harder on wrist pins) that affects VE.

[D K]

Originally Posted by stugray

Increasing the engine stroke not only gives more torque due to increased displacement, but it also increases the lever arm length of the rod pushing on the crank.
So there is another factor that increases overall hp by stroking

Allright.

Well thanks for clearing that up.

[Hyper4mance2k]

Originally Posted by themadscientist

I'm American and my Japanese is atrocious, but I get by.

I don't know about him, but he seems schizophrenic, he keeps referring to himself as "we."

Schizophrenia and multiple personality disorder are completely different mental illnesses. Linking the two is like saying everyone with a cold has swine flu.

[celek]

Originally Posted by HaDDeS

HKS offers three different metalic headgasket for the FA20 to use in addition of the stroker kit. 0.5 , 0.7 , 1 mm they respectively lower the compression ratio (in case of a FI setup) to 12.4 , 12.1 and 11.7

It doesn't sound like much, but it makes a difference and all elements put together offer that litle more wiggle room for tuning and more output.

The HKS cams are also stated to require the HKS pistons and the higher capacity / stroker kit. People keep in mind you can not just toss these in a stock motor as I think the valves will make contact with the pistons.

Have we covered that already?