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#90387 - 07/31/16 08:57 AM Re: Update [Re: McGoo]
McGoo Offline
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Registered: 09/24/05
Posts: 121
Loc: Airdrie, Alberta
Got the car together and running. EFI on and tune just getting started.
Then the distributor gear piles up and takes the cam with it. mad

So gotta haul the car back to Calgary and get that crap sorted out. Looks like it's going to be a next year project now.

Paul
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V8 camaros are like navels,...everybody has one.
EFI Turbo 250 project well under way.

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#90841 - 11/04/16 09:34 AM Re: Update [Re: McGoo]
McGoo Offline
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Registered: 09/24/05
Posts: 121
Loc: Airdrie, Alberta
Well,.....according to the engine builder the reason the distributor gear roll pin came out of place is harmonics due to oil pump cavitation.

Im using a Melling M62HV oil pump. Anyone ever had any issues with that?

Paul
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V8 camaros are like navels,...everybody has one.
EFI Turbo 250 project well under way.

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#90842 - 11/04/16 09:53 AM Re: Update [Re: McGoo]
Blackwater Offline
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Registered: 05/20/16
Posts: 203
Loc: Middle Tennessee
I've seen distributor gear pins staked or bradded. You'll have to use a slightly longer pin and maybe a little heat!!
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#90843 - 11/04/16 09:58 AM Re: Update [Re: Blackwater]
McGoo Offline
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Registered: 09/24/05
Posts: 121
Loc: Airdrie, Alberta
They are tacking it in place with a spot weld, and machining the distributor collar to get a better fit to the cam gear.
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V8 camaros are like navels,...everybody has one.
EFI Turbo 250 project well under way.

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#90939 - 11/25/16 04:01 PM Re: Update [Re: McGoo]
JStewart Offline
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Registered: 11/03/12
Posts: 96
Loc: Virginia
That Camaro is awesome. That is some mighty fine 250 pron. Amazing work.
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#90947 - 11/26/16 02:58 PM Re: Update [Re: McGoo]
Mean buzzen half dozen A.K.A. Hank Offline
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Registered: 09/23/04
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Loc: Ca
I had nothing but problems running the Melling HV oil pump. I t wiped out 3 different cams and distributor gears. I switched to a standard volume pump and never had a problem since
MBHD

The two cams were Clifford's and one American camshaft all new distributor gears were installed.
If you insist on using a HV oil pump I would install a bronze distributor gear so it won't wear out the camshaft, but the distributor gear will need replacing after it gets worn, but it will save your camshaft.
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#90995 - 12/03/16 10:49 AM Re: Update [Re: Mean buzzen half dozen A.K.A. Hank]
McGoo Offline
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Registered: 09/24/05
Posts: 121
Loc: Airdrie, Alberta
Thanks for the tip Hank.

Anyone else had issues with the Melling pump? Melling states that they have no known issues with the pump and they would like to have the old pump back.
The engine builder is absolving himself of any fault in this so I am looking at another few $K gust to get this thing running again.

If this keeps up I think it will be time to drop the 6 and go for an LS conversion.

Paul
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V8 camaros are like navels,...everybody has one.
EFI Turbo 250 project well under way.

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#90999 - 12/03/16 04:23 PM Re: Update [Re: McGoo]
Mean buzzen half dozen A.K.A. Hank Offline
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Registered: 09/23/04
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Loc: Ca
A rule of thumb for SBC does not really apply to our 250 inlines about for every 1000 rpm you need 10 psi of oil pressure.
IIRC Mike Kirby had told me 40 psi at 6000 RPM would be OK for oil pressure.
There has been others that have had the same problem with that high volume pump causing wear on the camshaft and distributor gear.

MBHD
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#91062 - 12/10/16 04:09 PM Re: Update [Re: JStewart]
McGoo Offline
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Registered: 09/24/05
Posts: 121
Loc: Airdrie, Alberta
Originally Posted By: JStewart
That Camaro is awesome. That is some mighty fine 250 pron. Amazing work.


Thanks, I just wish I had the chance to drive it this summer.

But, hot rod weather is just 6 months away so lots of time to get it ready.

Paul
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V8 camaros are like navels,...everybody has one.
EFI Turbo 250 project well under way.

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#91063 - 12/11/16 09:21 AM Re: Update [Re: McGoo]
THE FRENCHTOWN FLYER Offline
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Registered: 05/04/00
Posts: 1352
Loc: FRENCHTOWN
Don't "tack" the distributor gear on the shaft. Drill the roll pin hole to 1/8, make a solid pin from 1/8 welding rod, and with a TIG torch ball up one end, insert pin and ball up the other end. Failure proof. I doubt the pin failure was caused by oil pump "cavitation". All HD Melling pumps I've used on O/T brand have work flawlessly


Edited by THE FRENCHTOWN FLYER (12/11/16 09:21 AM)
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#91064 - 12/11/16 10:23 AM Re: Update [Re: THE FRENCHTOWN FLYER]
Hotrodrobert Offline
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Registered: 10/15/10
Posts: 15
Loc: Charlotte, NC area
I have had problems with Melling pumps in Chevy big blocks and in Pontiac v-8. I will be hard pressed to use Melling pumps again and several other builders I know will not use them.

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#91065 - 12/11/16 01:05 PM Re: Update [Re: McGoo]
THE FRENCHTOWN FLYER Offline
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Registered: 05/04/00
Posts: 1352
Loc: FRENCHTOWN
I guess I've been lucky then. Just out of curiousity, what was the nature of the failures you have experienced with them? Loss of pressure? galling / seizure? "cavitation"? Did the other builders experience the same kind of failures or different?
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#91081 - 12/14/16 10:56 AM Re: Update [Re: McGoo]
gbauer Offline
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Registered: 08/11/14
Posts: 810
Loc: Maryland
Originally Posted By: McGoo

If this keeps up I think it will be time to drop the 6 and go for an LS conversion.


Dibs on your six stuff.

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#92854 - 11/06/17 07:10 PM Re: Update [Re: McGoo]
McGoo Offline
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Registered: 09/24/05
Posts: 121
Loc: Airdrie, Alberta
Well,.......

Can't get the car to run properly on the FAST XFI system.

After a lot of head scratching and a couple of beers, and great advice from Tom Lowe I am ditching the TBI and going with port injection.
Head is off and intake port dividers are going in.
Hopefully going to see some results in a few weeks.

Maybe some day I will actually get to drive this car.

Thanks again to Tom Lowe. His research, advice, and parts have been a good influence on this project.

Paul cool
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V8 camaros are like navels,...everybody has one.
EFI Turbo 250 project well under way.

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#92855 - 11/06/17 07:19 PM Re: Update [Re: McGoo]
TheSilverBuick Offline
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Registered: 12/22/10
Posts: 460
Loc: Ely, NV
Persistence goes a loooooong way.
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Rebuilding an OHC Pontiac 250 with EFI and a Turbo

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#92859 - 11/07/17 07:53 PM Re: Update [Re: McGoo]
McGoo Offline
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Registered: 09/24/05
Posts: 121
Loc: Airdrie, Alberta
Here is a question for the masses.

Knowing that the fuel atomization from the FAST TBI is not the greatest, is it worth it to even consider trying to run with boost using the TBI and the dividers, or am I likely to run into the same lean outside cylinders vs rich inside cylinders?

I'm thinking best option is cut to the chase and finish off the port injection, but I am curious if anyone has successfully run a boosted inline with TBI and the dividers?

Paul
_________________________
V8 camaros are like navels,...everybody has one.
EFI Turbo 250 project well under way.

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#92860 - 11/08/17 06:09 AM Re: Update [Re: McGoo]
TheSilverBuick Offline
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Registered: 12/22/10
Posts: 460
Loc: Ely, NV
My understanding from people who have done per cylinder O2 monitoring is the modern TBI fuel distribution problem is because the fuel is injected right into the plenum, and gets the full air distribution issues every intake manifold has. The old GM and other OE TBI's had the injector above the throttle blades which mixed the fuel into the air more evenly as it passed by the blades. Even when you can see fuel puddling up on the blades at part throttle! Basically equivalent to a carb.

I have not seen tests of the MSD Atomic unit, but the injectors are above the throttle blades so I'm assuming better fuel distribution.
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Rebuilding an OHC Pontiac 250 with EFI and a Turbo

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