DIY manifold porting

Post by **Bigvinnie** » Fri May 18, 2007 8:50 am

Hi guy's I've been doing the right up on DIY manifold porting for the KA24de. I really don't have time to re write the thread again. If you guy's have any questions or comments on improvements you think I should make let me know. I'm always open to suggestion and opinion.http://www.club240.com/forums/...39204

Post by **neverlift** » Fri May 18, 2007 9:21 am

yeah I saw this the other day when you link'd it....

I did some porting of my sohc intake manifold some time ago, and feel it was worth the efforts(sohc) no dyno or flow charts so w/e, the upper was enlarged/smoothed(somewhat),all cast marks and bosses removed,the t/b port was enlarged as well to fit with the ported t/b. Bottom manifold was left stock(clean up head/mani ports slightly). IMHO it would have felt stronger with a header(glad I hadnt buy it yet lol). I'll quit rambling de goes in tomorrow so the story begins. Again.

are you gonna dyno this vs stock? how about stock vs this and egr/scv removed dyno let us know

Post by **Bigvinnie** » Fri May 18, 2007 9:49 am

The whole concept why I wanted to start the thread was for a dyno.Now my engine isn't stock and has work done to it. I will be using a stock auto transmission ecu, and I will be reseting the SAFC values to 0 in order for people to get a grasp on the gains that would be as close to stock. Once I have that dyno then I will dyno again with the SAFC values plugged in I'm shooting for an estimate of 175WHP with the mods.So in all there will be a total of 3 dyno charts. One chart with SCV's, the other with removal of scv's and manifold porting, and the third chart with SAFC values.This is basically an experiment for stock engine with bolt on applications.I'm also out to prove that ITB's on a KA is a worthless modification. It alsodoesn't prove for any gains on a KA as far as HP is concerned. If I really wanted ITB's I would just keep the secondary butterfly's in my runners.

BTW why did you completely grind out the bosses? I think I will just be enlarging mine.

Post by **s13 drifta** » Fri May 18, 2007 8:01 pm

I was thinking about porting my intake runners but now Im going to do it for sure. How long does it take to get the intake manifold off? It looks like a *****.

Post by **Bigvinnie** » Fri May 18, 2007 8:31 pm

s13 drifta wrote:I was thinking about porting my intake runners but now Im going to do it for sure. How long does it take to get the intake manifold off? It looks like a *****.

You can take the intake manifold off in under an hour. Make sure to get all new coolant, and vacuum lines when you put it back together.

Post by **neverlift** » Mon May 21, 2007 1:51 am

you know the lil f*** marks INSIDE the runners....

they looked like 2 little circles inside each runner(in the middle of the cast lines)

Post by **Bigvinnie** » Mon May 21, 2007 8:31 pm

neverlift wrote:you know the lil f*** marks INSIDE the runners....

they looked like 2 little circles inside each runner(in the middle of the cast lines)

You lost me?

WWJD · Post by **WWJD** » Mon May 21, 2007 9:39 pm

nice work. looks like something that I would like to do to my DOHC. I'm not to familiar wif it yet. Ikonw the SOHC much more better. Bigvinnie by removen' the 2nd-arry (scv) (butterfly valve's) will that hurt emission's out here in the bay area? I've gotta 91' s13. you know how harsh they can be out here. school me man

Post by **neverlift** » Tue May 22, 2007 2:14 am

Bigvinnie wrote:
You lost me?

damn it I should have taken pics. get a sohc manifold/runners. they have little circular humps in every runner. ghey

Post by **Bigvinnie** » Tue May 22, 2007 6:04 am

WWJD wrote:nice work. looks like something that I would like to do to my DOHC. I'm not to familiar wif it yet. Ikonw the SOHC much more better. Bigvinnie by removen' the 2nd-arry (scv) (butterfly valve's) will that hurt emission's out here in the bay area? I've gotta 91' s13. you know how harsh they can be out here. school me man

I've removed the SCV's on several other s13's. I use to think that it was apart of smog emissions. Come to find out the scv's are actually for cold weather climate conditions. If in fact you live in a cold climate it can prevent a a solid A/F ratio using the 240/248 cams. The butterfly's are used to heat up the cold air and cause swirl for a better mixture. Living in the Cali bay temperatures don't really fall below 40 degrees so you should be fine. If you lived further up north such as MT SHASTA I would say leave the butterfly's in place.I will be modifying the coolant paths by enlarging them this should help for a better mix in the ratio to heat up the cold air intake charge. If it ever becomes really bad (which it shouldn't in the bay area) you should just always leave the TB coolant lines in tact instead of doing the TB coolant bypass. modification.

Post by **Bigvinnie** » Tue May 22, 2007 6:05 am

neverlift wrote:damn it I should have taken pics. get a sohc manifold/runners. they have little circular humps in every runner. ghey

I know what you talking about now the DOHC's have them too. You just can't see them because they are to deep in the curvature of the runner for me to take a pic.

Post by **neverlift** » Tue May 22, 2007 9:26 am

DIY manifold porting

DIY manifold porting

Re: DIY manifold porting (Bigvinnie)

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Re: DIY manifold porting (Bigvinnie)

Re: DIY manifold porting (s13 drifta)

Re: DIY manifold porting (Bigvinnie)

Re: DIY manifold porting (neverlift)

Re: DIY manifold porting (Bigvinnie)

Re: DIY manifold porting (Bigvinnie)

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