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Re: Bigger turbo / Block reinforcements? Long! Posted by 900 Aero [Email]  (#425) [Profile/Gallery]
(more from 900 Aero) on Tue, 26 Feb 2008 09:21:12
In Reply to: Bigger turbo / Block reinforcements?, ChrisMiami  [Profile/Gallery]
, Tue, 26 Feb 2008 06:30:47
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Hi Chris, assuming you have a C-900 that actually used Saab's half of a V-8 design you can run even more power as far as the block, crank and rods are concerned than the later Saab engines where lots of HP is made because of all of the Trionics upgrades etc. that are available. If you do have a C-900 you're limitations would mostly be your trans and up to a point the rest of the drive train. Up until '91 (when GM took over) Saab used a similar material in their crankshafts to 5140, at least it machines like 5140! The hardening on this earlier material is so good that you can regrind up to -.020" without re-hardening. Also the rods are bullet proof especially if you go to custom fit after market bolts and nuts. We use after market rods because the original ones are rather heavy and to get a better rod length to stroke ratio with our longer rod / shorter pin height piston combination. I use full shank main cap studs so with the half of a V-8 design and these studs set a little deeper into the block no girdle is necessary. "Internally" balanced rotating assembly doesn't apply to an early Saab other than maybe what we do on the later cranks when the balance shafts are removed so there's not a vibration problem. An internally balanced engine is one that doesn't require an externally weighted flywheel or dampener like the 454 Chevy uses for example. Saab's rotating assembly / reciprocating assemblies are very closely balanced so I go nuts and re-balance them to the point of ridiculous We bore our Saab blocks to + .020" (.50mm) over size only because we've never been able to find a ring combination for and only 2 or 3 thousandths over bore like we do on the 2.1 blocks. It would however be OK to use a fat set of forged piston an just touch-up the bore to get the proper clearance which is what I'll be doing on the later Saab engines then standard rings still work providing the ring end gap isn't too great. We use Vandervell bearings which are what NASCAR had to recreate when Vandervell quit making domestic bearings. More oil capacity is always good but Saab's oiling system is so good that just a larger oil cooled is all you'd ever need. As far as a bigger turbo, T3/4 is a widely misused term but we do have a very lag friendly one that makes a ton of power without sacrificing much low end! Hope this helps, Dave at SPG9.
posted by 204.16.14...
, Tue, 26 Feb 2008 06:30:47, Tue, 26 Feb 2008 09:21:12 <-- Viewing This Message, Tue, 26 Feb 2008 09:56:04
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