GMC Syclone/Typhoon

GMC Syclone/Typhoon

Postby fungus2k [OP] » July 5th 2009, 4:31pm

Anyone ever try to put a GMC Syclone or Typhoon 4.3 in the safari. I'm assuming these are hard to find, and it would probably be easier to buy an aftermarket turbo kit
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Re: GMC Syclone/Typhoon

Postby Matrixx » July 5th 2009, 8:12pm

Hi fungus2k

I have heard of them yes. I don't think they were to popular because of the problems manufacturers were having at the time with the Dry Turbo system. A lot of early engine failures because of it. Very powerful when they did perform though.

They are scarce as hens teeth to find. Overall I would personally opt for an updated after market turbo kit myself. They have made a lot of changes to the turbos for reliability since the Syclones or Typhoons. Just a thought.:)
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Re: GMC Syclone/Typhoon

Postby Mr_Roboto » July 5th 2009, 11:19pm

The Syclone long block had pistons and main caps, but that was it. The main caps being necessecary is debateable especially at the power levels they ran. You could probably as well if not better with a set of low compression forged pistons in a 4.3L motor, as they had the same heads cam etc. as a TBI engine. Besides that, I would at least use L35 (92+ "W" motors) rods and ARP bolts for any sort of real power. For a turbo I would be thinking a Holset HX40, 60-1 or a Powerstroke turbo with a .85 turbine (they made some PSD turbos in 1.10) for use with the stock cam. While the Syclone intakes are awesome and the turbo manifolds are nice, from what I've seen they have clearance issues in the Astros and the turbo/intercooler are too small for a stock motor much less anything that's decently built. Fuel wise an in tank Walbro 255lph and some 42lb/hr injectors or bigger (60s preferred) would work nicely. Engine management can be one of several things, I would be tempted to use the stock Syclone 1227749 box as they are very well documented and have a great aftermarket. Besides that get some flanges and weld up headers and a downpipe. You may even be able to take a passenger side manifold put it to the drivers side and then run a crossover to the passenger side and stick the turbo there. That's the plan for my setup anyways.
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Re: GMC Syclone/Typhoon

Postby Mr_Bowtie » July 6th 2009, 4:15am

Why not throw in a 3.8L LC2 Buick motor? (Out of a '86-'87 Buick Grand National/T-Type.) I have seen those motors put in far weirder things. And in stock form they are very reliable. :mrgreen:
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