Porting Update

[Polo-1]

what are you saying Rob, my 350 gonna run like sh*t

Happy New Year

Do you have time to fix the Plenum

[Locobob]

Originally Posted by Polo-1

what are you saying Rob, my 350 gonna run like sh*t

Happy New Year

Do you have time to fix the Plenum

Yep

Naw J/K ... you'll have more airflow than you need though - probably trade some mid range torque for hp up top. Got a lot going on right now but maybe I can get you fixed up before summer time.

[Locobob]

Originally Posted by LGAFF

Injector housing is yet to be seen. Will also be port matching the heads.

LGAFF
92 ZR1
#234

Looks pretty good so far. Here's a hot tip that may be a bit late: I always check the port match first - usually the parts are skewed in one direction so checking the port alignment first keeps you from having to remove more material than intended i.e. ending up with larger ports than you planned on.

Originally Posted by Locobob

Yes they could have a higher volume, bottom line though: bigger is not always better. The key is to tailor the intake to the motor, a mild 350cid will have different airflow needs than a full tilt stroker.

Hello Robert, Long time No See !!
welcome back man !

Bigger is better ONLY if you want Feed the motor with +15 PSI,Turbo Supercharging it!

[Vette Guy]

Originally Posted by Locobob

Yep

Naw J/K ... you'll have more airflow than you need though - probably trade some mid range torque for hp up top.

I can't emphasize this any more than Robert. You're going to end up with a different running car. The 4:10s make up for much of the lost mid-range torque - I wouldn't recommend this with 3:45 gears with a stock 350. Lots more power WOT and above 5K, but how often are you full in it during regular driving? Not to dissuade you, rather ensure you understand what you are into.... not bad, just different

Mark

[bradslt5]

would a decent coprimise be to reduce the primary inj lump, and to just clean up the ports with a flap wheel. dont the lumps in the 90-92 housing the main diff. between them. I have thought of trying to do this. it wouldnt be so time consuming and might give a 15 hp increase without losing the mid range.

[cuisinartvette]

IMO toomuch work for a gain you may not even feel. If youre gonna do it go all the way. I got chastised from a few guys this week for messing with what in their opinion was "perfection" out of a box. Screw that.
There is always room for improvement, its the little stuff that makes a difference.
http://forums.corvetteforum.com/show...62&postcount=2
http://img.photobucket.com/albums/v2.../296641283.jpg

Look forward to the day when I can go nuts on my LT5 heads.

[petefias]

Originally Posted by Locobob

Yes they could have a higher volume, bottom line though: bigger is not always better. The key is to tailor the intake to the motor, a mild 350cid will have different airflow needs than a full tilt stroker.

The original comparison was between dual intake ported to 36mm vs. siamesed ports not between a 350 vs. 415 application.

When you NEED bigger, the siamesed port is bigger than a 36mm individual port, you agreed to that. The requirement/necessity of a bigger intake is a different issue all together.

[Locobob]

Originally Posted by petefias

The original comparison was between dual intake ported to 36mm vs. siamesed ports not between a 350 vs. 415 application.

When you NEED bigger, the siamesed port is bigger than a 36mm individual port, you agreed to that. The requirement/necessity of a bigger intake is a different issue all together.

You asked if an oval or oblong port design could have a higher air flow potential than dual 36mm ports, I answered yes it could. Obviously it depends on the overall port size - circles are easy to measure, figure 8's are a bit more challenging. Let's say they are identical in area, would their be an advantage to the siamese design? I'm going to say yes - the siamese should have a slight advantage. Air tends to move faster in a ports short side radius and slower at the ceiling (think D port heads) - a siamese port has a larger short side radius than dual rounds therefore it should be able to move a bit more air. The siamese design also effectively shortens the runner lengths therefore favoring high rpm power over low-mid range (much like a single plane vs. dual plane carb. manifold). This could be good or bad depending on the rest of the car and also personal preference / driving habits.
Is this what you were after?

[petefias]

Originally Posted by Locobob

You asked if an oval or oblong port design could have a higher air flow potential than dual 36mm ports, I answered yes it could. Obviously it depends on the overall port size - circles are easy to measure, figure 8's are a bit more challenging. Let's say they are identical in area, would their be an advantage to the siamese design? I'm going to say yes - the siamese should have a slight advantage. Air tends to move faster in a ports short side radius and slower at the ceiling (think D port heads) - a siamese port has a larger short side radius than dual rounds therefore it should be able to move a bit more air. The siamese design also effectively shortens the runner lengths therefore favoring high rpm power over low-mid range (much like a single plane vs. dual plane carb. manifold). This could be good or bad depending on the rest of the car and also personal preference / driving habits.
Is this what you were after?

Got it. Thanks.