#66552 - 09/28/11 07:58 PM
Re: intake port dividers (prototype)
[Re: Turbo-6]
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tlowe #1716
12 PORT ADVERTISER
Active BB Member
Registered: 04/01/04
Posts: 2327
Loc: Dysart, Iowa
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Here is a couple pics of the newer divider. The engine runs much better.
Better starting
better idling
better acceleration
Less fuel needed.
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#66558 - 09/28/11 08:35 PM
Re: intake port dividers (prototype)
[Re: Mean buzzen half dozen A.K.A. Hank]
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tlowe #1716
12 PORT ADVERTISER
Active BB Member
Registered: 04/01/04
Posts: 2327
Loc: Dysart, Iowa
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Hank,
This head was installed last year in May 2010. I documented it in my 292 turbo writeup. Just posted this here to help keep the data in one place.
Short story. Last year took it to the track and ran it. It performed the same but had power loss. Found out days later the distributor was the problem. So no proven track times.
No lumps because of the turbo and the smaller port window. It does make more power but no dyno close by or time to do it.
The storm that hit me this year was a summer wrecker. Missed out on a week of vacation to cleanup the mess and rebuild my blown down building (just like it was done by the big bad wolf to the piggies). New building is up but much to do to get ready for winter.
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#66597 - 10/02/11 06:36 PM
Re: intake port dividers (prototype)
[Re: copo-rat]
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TheSilverBuick
Active BB Member
Registered: 12/22/10
Posts: 25
Loc: Ely, NV
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As a pro-lurker here due to my work's firewall preventing me from leaving posts, I just want to say thanks Tom for posting up pictures and updates on the EFI turbo projects. I keep watch as I start working on my turbo'd EFI Pontiac OHC six.
_________________________
Rebuilding an OHC Pontiac 250 with EFI and a Turbo
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#66603 - 10/02/11 08:06 PM
Re: intake port dividers (prototype)
[Re: Beater of the Pack]
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tlowe #1716
12 PORT ADVERTISER
Active BB Member
Registered: 04/01/04
Posts: 2327
Loc: Dysart, Iowa
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Beater,
The second pic is my intake manifold after I matched it to the new head port.
Copo Rat,
Yes those same type dividers can be done, but the head has to come here. Too much fitting.
Silver Buick,
Thanks for the pat on the back. Just trying to keep good info out there for other people to use. Today recieved a phone call. Guy has a 292 that is turboed and making way too much boost. He wants 5-7 and is seeing 14 psi by 4K rpm. He is getting scared of hurting it. We discussed his whole motor and I gave him some ideas on how to calm it down. Ultimately ,I think his turbo has too small of a exhaust housing for his exhaust wheel. He has a Garret 3788 with a .89 exh housing. Just trying to tell him from my experience.
Edited by tlowe #1716 (10/02/11 08:44 PM)
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#66605 - 10/02/11 08:51 PM
Re: intake port dividers (prototype)
[Re: Mean buzzen half dozen A.K.A. Hank]
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tlowe #1716
12 PORT ADVERTISER
Active BB Member
Registered: 04/01/04
Posts: 2327
Loc: Dysart, Iowa
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Never used a housing that big on mine. You are right , have a .84 currently.
His is making too much boost and thats why he called me. I did not sell him his parts , but am trying to help him figure it out.
Yes , when I looked up his turbo, those are the next sizes. They seem to only offer 1 exh wheel. I am used to Turbonetics, they offer different wheels and housings.
What do you think his problem is?
He has timing pulled out with boost
A working wastegate
builds boost quickly
using a blow thru carb setup
water/ alc injection
This stuff is only going to detract from the original post.
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#66621 - 10/03/11 09:16 PM
Re: intake port dividers (prototype)
[Re: Turbo-6]
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Turbo-6
Active BB Member
Registered: 12/04/05
Posts: 305
Loc: St. Louis Mo.
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Copo-rat,
Dividers are easy to make just cut a cardboard template that fits the port and cut out a piece of steel held in by a bolt or tapered plug in the top of the bolt boss, I have been dividing ports since about 1965, used cast iron crank counter weights furnace brazed in to use the stock bolt, cut steel flat plates bolted in, cast steel wing shaped dividers that bolt in, the same cast wing that goes behind the stock boss that is tacked welded and epoxied in place, all work just fine.
Tom, Very innovative idea of opening the top of the port, have you tried to see what the flow is, how thick do you think the port is afterwards, you should sonic test it. How wide is it at the top now that it's ported ?
Harry
_________________________
Turbo-6
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#66628 - 10/04/11 03:37 PM
Re: intake port dividers (prototype)
[Re: Turbo-6]
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Mean buzzen half dozen A.K.A. Hank
Active BB Member
Registered: 09/23/04
Posts: 4545
Loc: Ca
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Harry,
I did not take any pics of the intake port after I devided it & raised & widened the port.
You are correct about not much sealing area after opening it up this much.
If you really want to see what a stock head can do w/a turbo & deviders installed.
You would really need to braze the top of the port.
Raise the roof as much as possible & widen the port.
With a turbo & devided port, you should not be so concerned w/intake port volume, you need to concentrate more on how big you can make the intake port window.
Having a better short turn radius helps, but if you are looking to make a lot more power w/your turbo & deviders, focus on the
smallest area of the intake port (basically @ the mating surface area on the cyl head to your intake manifold)
IMO, we do not have a lot of options when it comes to having a good flowing cyl head when running deviders also. Those two things usually does not go hand in hand.
Thankfully you have a turbo that will force the air/fuel into the cylinder head even w/the deviders & having horible flow numbers because the the devider & no lumps.
I was always concerned with intake port velocity when being naturally aspirated, need decent port velocity to make any type of bottom end torque.
But when you are forced induction, worrying about port velocity is not a concern, throw that type of thinking out the window.
Just make the smallest portion of you intake port as big as possible w/out going too crazy (less reliable, sealing issues etc)
I believe you can make more power this way than if you are running a small port w/deviders & lumps. (only forced induction I'm saying)
MBHD
_________________________
12 port SDS EFI 
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