Porting Update

[LGAFF]

Thought I would give everyone the update on porting project. I have learned a few things. I did the intake plenum with a dremel soft metal attachment on a flex shaft. This was great for the short turn and immediately inside the runner opening. It was not good for hitting the long turn due to the angle, and left some small marks, which I am going to clean up with a flap wheel later. If I did this over I would focus on using a flap wheel or other device on the long turn as the material removed is minimal.

After roughing everything out I went back, and used a barrel sander on a drill to try and keep everything "rounded" and symmetrical, this worked well. Finally I took some sandpaper and hit the short turn radius leading into the plenum body using my fingers. Both the drill and dremel worked surprisingly fast.....WD40 or grinders grease doubles the speed with which material is removed. I should have everythng cleaned up by the weekend.

Here are a few few photos.......hopefully I am not a total hack.

1)Photo of runners: note I have not flushed the material out of the body as of yet

http://i134.photobucket.com/albums/q115/lgaff/DSC02390.jpg

2)This is the 36mm fooseball in the runner.
http://i134.photobucket.com/albums/q115/lgaff/DSC02393.jpg

3)Straight shot down the runner, notice the long turn has a few "gotcha" spots I am going to hit these with a flap wheel to smooth them out

http://i134.photobucket.com/albums/q115/lgaff/intakesd.jpg


4)This is the one spot to watch out for, the material is thinner here than in other areas, I have one spot I am going to have some material added

http://i134.photobucket.com/albums/q115/lgaff/thinspot.jpg

Let the flaming begin.

LGAFF
92 ZR1
#234

[Jeffvette]

How many hours do you have in, and how far along in the job do you think you are?

[LGAFF]

The start was so slow, I was really trying to work down the short turn with files, etc. its hard to say.......if I charged what you charged(obviously I'm a hack compared to you) I would be in violation of the fair labor standards act as I would be making far less than minimum wage. If I went into the next one knowing my mistakes on this one I would say I could do a plenum in 12- 15 hours. Not knowing the proper tools definately has its price to be paid in quality and speed.

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

LGAFF
92 ZR1
#234

[Jeffvette]

The start was so slow, I was really trying to work down the short turn with files, etc. its hard to say.......if I charged what you charged(obviously I'm a hack compared to you) I would be in violation of the fair labor standards act as I would be making far less than minimum wage. If I went into the next one knowing my mistakes on this one I would say I could do a plenum in 12- 15 hours. Not knowing the proper tools definately has its price to be paid in quality and speed.

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

LGAFF
92 ZR1
#234

I just wanted people to know. It's a steep learning curve. So far looks good. Keep an eye on port alignment. By the time you invest in tools and the time to learn and make a few mistakes it can be costly.

[LGAFF]

I am trying the poor mans version, certainly what you do is a bargain. Using smaller tools: dremel, etc is like trying to fix a body panel with a small sanding block, smoothing everything out is difficult. You are correct on cost, air grinder sucks unless you have a 60+ gallon tank. Electrical grinder is $160 plus all the bits. Its also a nasty mess.

Proof will be in the pudding this summer to see if I can best my 12.54@117.25!

LGAFF
92 ZR1
#234

[Polo-1]

you got a long way to go:sign10:

http://i7.photobucket.com/albums/y292/kpie/KevinPietro003.jpg

[LGAFF]

That looks like the third runner I did.

LGAFF
92 ZR1
#234

[cuisinartvette]

For a first attempt...Using a dremel and a drill you did a great job.

Aint easy, is it?

Sent you a pm awhile back, did you recieve it?

Fwiw Jeff gives a killer deal on porting....People dont understand whats really involoved as far as skill, TIME, and tooling costs.
Learned my lesson about doing something like that for...cheap

[Pete]

Kicking ***, Lee

Looking good.

If all goes well 11's @ 120 MPH

Pete

[HADI-ZR1]

you got a long way to go:sign10:

http://i7.photobucket.com/albums/y292/kpie/KevinPietro003.jpg
whats the story behind this picture?:icon_scra

[LGAFF]

looks like a Jeal setup, sinus taken out of runner. two runners turned into one.


LGAFF
92 ZR1
#234

[gbrtng]

minor leak :sign10:

[tccrab]

whats the story behind this picture?:icon_scra

It's called "Siamesing" the runners.
The end result is this:

[Polo-1]

not Jeal's, but the same thing. Siamesed Plenum

http://i7.photobucket.com/albums/y292/kpie/KevinPietro001.jpg
http://i7.photobucket.com/albums/y292/kpie/KevinPietro002.jpg
http://i7.photobucket.com/albums/y292/kpie/KevinPietro004.jpg
http://i7.photobucket.com/albums/y292/kpie/kevintexas2.jpg

[HADI-ZR1]

polo,
what the different than Jeal's work?
i wanted to know how those area looks like before sanding and
polishing, is that Original surface is bad,that we must polish it?:rolleyes:

[Pete]

Hadi, on Jeals siamesed plenum a 36mm ball would not go thru the siemesed ports or slide it back and forth in the siamesed port.

Pete

[HADI-ZR1]

Hey Pete , easy man, i am NOOB !
show me pictures...:mrgreen:

[Pete]

Hey Pete , easy man, i am NOOB !
show me pictures...:mrgreen:

That was easy.
Any easier i'd be a manwhore.

Pete

[petefias]

Hadi, on Jeals siamesed plenum a 36mm ball would not go thru the siemesed ports or slide it back and forth in the siamesed port.

Pete

Don't mean to start a war, but couldn't an oval (or oblong) shape have a higher volume than two circle shape ports (even with a slightly bigger radius)?

[Locobob]

Don't mean to start a war, but couldn't an oval (or oblong) shape have a higher volume than two circle shape ports (even with a slightly bigger radius)?

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.

[Polo-1]

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

Happy New Year

Do you have time to fix the Plenum

[Locobob]

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

Happy New Year

Do you have time to fix the Plenum

Yep :D

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]

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.

[HADI-ZR1]

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 !! :worship:
:cheers: welcome back man !

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

[Vette Guy]

Yep :D

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/showpost.php?p=1563475462&postcount=2
http://img.photobucket.com/albums/v224/kalthoff1/296641283.jpg

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

[petefias]

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]

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]

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.

[HADI-ZR1]

Now this is intersting....!!
http://temp.corvetteforum.net/c4/doctorv8/415_dropped_plenum_detail.jpg

http://temp.corvetteforum.net/c4/doctorv8/415_inj_housings_7-21-2003.jpg

http://temp.corvetteforum.net/c4/doctorv8/415_done_hood_up_8-6-2003.jpg

[cuisinartvette]

Assuming the secondaries are missing to do that, whos car?

[Zr1 Destroyer]

Looks like Sanjays to me.

[Jeffvette]

Looks like Sanjays to me.

Yep, belongs to Sanjay.

[Polo-1]

Can not tell for sure, but it looks lke a Lingenfelter D port on the Injector housing. That would then follow into the head.

[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.*************.com/showpost.php?p=1563475462&postcount=2
http://img.photobucket.com/albums/v224/kalthoff1/296641283.jpg

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


Is there a reason why someone went in and edited my link????

[-=Jeff=-]

maybe the pictures were not showing.

Especially since the CF links are now censored they will no longer show