Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here.

          
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  #21  
Old 06-13-2019, 03:18 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
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Location: Phelps, NY 14532
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Quote:
Originally Posted by AIR RAM View Post
... Whats the length of a "Mini-Rod"? Do you remember if the engine was bored at all or was it the Std bore? Was it de-stroked as well?...
Mini-rod tractors are limited to 8' wheelbase, classes are usually 1,800 lb. ready to hook with driver. The bore was only honed out to 4.125" from original 4.121" to fit some blower pistons I already had, stroke was stock 3.75"- so I wound up with a Pontiac 401 c.i.

Taff- I had scrounged a junkyard block- I didn't know one 400 block from another. Perhaps it's a 1969? It's just 2-bolt mains, but main bearings still look new.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
  #22  
Old 06-14-2019, 05:40 PM
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Fast 69 Fast 69 is offline
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FWIW I'm running a 440" twin turbo engine in my 71 TA. 67' 400 block with splayed mains. Deburred and prepped. RPM 4" forged crank. 6.635 BBC spec H-beam Eagle rods. Icon dished pistons. Comp Cams solid flat tappet, .508 lift cam with #96 heads that are mildly ported. Cheap($184 each) Ebay GT45 turbos on home built long manifolds. Blow thru C&S carb on e85. Been street raced for over 2 years, shifting at 6000 rpm or so. Car weighs 3650 with me in it and has been 9.16@153 at 7600' corrected elevation. I believe that short stroke and relatively low rpm is what's keeps it together. I don't see any reason that a 4.5" crank won't work if the rpm is kept down. May not be ideal but will work. Good luck with it!

  #23  
Old 06-25-2019, 09:40 PM
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Tom Vaught Tom Vaught is offline
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Some good info in this article on engine specs even if it is a Belt Driven Vortech Supercharger dyno test vs a Turbo test.

https://www.hotrod.com/articles/hppp...-installation/

Don Keefe did a great job on the Article and the Pictures, this article was done many years ago.

A couple of comments:

The engine was a 2-Bolt block.
The engine did not have a large duration camshaft
The engine used readily available parts from the aftermarket, except for the Luhn Supercharger Brackets which Luhn has improved several time over the many years since that dyno test.

Vortech says the Supercharger was good for 820 HP and Luhn made 860 hp, the highest hp dynoed ever for that supercharger.

Some of the parts in the article (as well as the companies who made them are no longer the same company or not there at all).
Indian Adventures being one of them.

SO IF YOU ARE LOOKING FOR EXPERIENCE IN BOOSTING A STREET PONTIAC THAT MAKES 900 LBS/FT OF TORQUE AT 4800 RPM
GIVE LUHN A CALL.

Tom V.

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Last edited by Tom Vaught; 06-25-2019 at 09:56 PM.
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