Thread: SR23VE build (92x86)

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2012-01-13 15:08:45

#51

cory

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From what I've seen my 86x92 motor big bore stock stroke that motor made peak before 9k and held to 9?5.

Then when I dropped the new crank in peak dropped as it should. Peaked right before 8k. I wouldn't expect to make peak power after 8.5k. The sooner the better, with as much stroke as the 92mm with our short rods the piston speeds get going pretty fast.

And how long are the intake runners that your worried about them being too long? I think the longest runner you can fit will most likely be the best bet. 8in or so should be very very good, its just so damn hard to fit that kind of runner lengh w a plenum large enough...

Last edited by cory on 2012-01-13 at 15-22-42.

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2012-01-13 18:09:40

#52

Mikael

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Originally Posted by cory

Hmm ic I remember arguing and actually calling cp directly because they were unable to get my any higher then 13.5 on 86mm stroke and 14.3 ish with the same dome on a 92mm stroke. I guess that's a good thing for you, I'm surprised though because from the look of my dome there isn't any way to achieve a higher cr unless you make the valve reliefs shallower. Id like to see what the dome looks like when you get the pistons....

With stock chamber they quoted a max CR of 14.5, if I wanted to open it up they could do 13-13.2:1

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2012-01-13 18:14:28

#53

Mikael

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Originally Posted by cory

I could be wrong, but, I always thought that the higher your peak hp was, the more power you'd make.

I calculated my runners to be 24cm from valve seat to plenum.

I'm not to concerned about revving that high, I do have some mechanical sympathy.

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2012-01-13 18:15:46

#54

cory

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Yeah I was talking in refrence to stock chamber to. I just wonder what's changes since then, unless they were confused and thought I was having my chamber cnc'd

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2012-01-13 18:19:18

#55

Mikael

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Could be.

They recommended stock exhaust valves on NA, so I'll just go oversized on the intake.

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2012-01-13 18:31:46

#56

cory

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And yeah in a perfect world when you cam can keep up effiencinecy at higher rpm then yes. But honestly the 184c is not that big, esp on our 2.4liters. If you spec everything to work together rather then just max rpm you will be better off. The 184c chokes our motors at 8k or something like that with stock valves in place according to calculations...

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2012-01-13 19:04:40

#57

STRATTON

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Originally Posted by cory

And also this couldn't be further from the truth. The longer the header primaries are the sooner it peaks..... but you try and match the runner length to the cam profile rather then change your curve with the header. You will make a better curve and more power when you set the lenghts in accordance to the cam timing...

The longer the header the more time it takes to reach peak in turn raising peak.

this worked on my 2.4 i made peak at 8500, while most other guys peaked before 8k. And my cams werent dialed in.

Stratton.

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if ruled the world and everything in it, skys the limit id push the q 4 5 infinit....

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2012-01-13 19:06:48

#58

cory

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Originally Posted by STRATTON

Don't make me laugh so hard when I'm at work man

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2012-01-13 19:09:47

#59

Kyle

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Originally Posted by STRATTON

The longer the header the more time it takes to reach peak in turn raising peak.

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2012-01-13 19:27:02

#60

cory

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Originally Posted by STRATTON

header length was a lil longer then 24inches. the longer the header the higher it makes peak rpm wise.

as far as header sizes go it was 1 3/4 to 1 7/8 to 2 inch about 6 inch increments iirc. only thing i would have changed was the size of the choke, it had a 2 3/4 choke.

the intake plenum i forget the exact specs.

stratton.

And I thought 6 x 3 was 18in?

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