: Short runner intake



airfuel2001
09-08-07, 09:35 PM
Here is my version of a SRI, I asked about your intakes and nobody answered...so i made one. It took me half a day to remove runners, and a half a day to re-attach. Oct. 6 is my dyno day, just on startup it responded quicker up the tach, and it feels better below 2500 (even though thats not what I expected). I guess well see... next is the mass air meter...

http://www.cadillacforums.com/forums/attachments/northstar-performance-technical-discussion/35201d1189298118-short-runner-intake-intakeside.jpghttp://www.cadillacforums.com/forums/attachments/northstar-performance-technical-discussion/35202d1189298118-short-runner-intake-intakecut.jpghttp://www.cadillacforums.com/forums/attachments/northstar-performance-technical-discussion/35203d1189298118-short-runner-intake-intakecut2.jpghttp://www.cadillacforums.com/forums/attachments/northstar-performance-technical-discussion/35204d1189298118-short-runner-intake-intakeglue.jpghttp://www.cadillacforums.com/forums/attachments/northstar-performance-technical-discussion/35206d1189299196-short-runner-intake-intaketb.jpg

fubar569
09-08-07, 10:43 PM
i love the way you did that!

any leaks?
what epoxy did you use to reseal it?
how did you cut it so clean?


i ported through the TB hole, but i did a piss-poor job - i wanna cut it open like yours and redo it...

Raze
09-08-07, 11:21 PM
Wait, I'm confused, did you gut the interior?

airfuel2001
09-09-07, 01:22 PM
No leaks, I am sure I could put boost to it without problems, it doesn't feel fragile at all. I cut it with a hack saw blade so I could go slow and not melt the plastic. And yes it is gutted on the inside, go outside and put a flashlight down your intake and you will see the difference.

fubar569
09-09-07, 02:13 PM
No leaks, I am sure I could put boost to it without problems, it doesn't feel fragile at all. I cut it with a hack saw blade so I could go slow and not melt the plastic. And yes it is gutted on the inside, go outside and put a flashlight down your intake and you will see the difference.

i had an additional idea last night about cutting holes in the roof of the intake...like the inside roof...to further shorten the runners. i can only suggest this for built motors however as it would result in serious low end torque loss...

i may still try it though...

thanks for the post back...i might go home this week and try it...or on my next set of vacation days...

though i just have one more...what epoxy did you use?

Raze
09-09-07, 03:17 PM
post some numbers once you run it on the dyno...

codewize
09-09-07, 04:18 PM
I guess I'm not familiar enough with the way the intake loos to see whats going on here. I can see the one looks like it's been cut down but I don't understand the gutting the inside part?

I am very curious to see if the top end takes a HP / Torque hit on this.

eldorado1
09-09-07, 04:55 PM
awesome. I didn't want to do mine like that because I was nervous about the expansion/contraction pulling apart the intake at the seam. Considering the intake is under "pressure" at 15 psi, I didn't want to chance it. I want to get it redyno'd but it's on the bottom of my list of things to do.

Did you take a look at the intake gaskets to compare to the heads? I found on mine, they were constricting the intake ports by ~1mm on all sides.

Also curious if you have a before dyno to compare. I think you'll see some nice gains from 3000 on at the expense of the <3000 torque. The better low end/throttle response is due to the (now) larger intake plenum volume.

weister42
09-09-07, 11:57 PM
Cool...this looks promising and I actually have a spare intake manifold...

Highline Cady
09-10-07, 04:25 AM
Nice pictures, I look forward to your post after dyno day.