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Re: 9000 pistons in 900T16? Posted by 900 Aero [Email]  (#425) [Profile/Gallery]
(more from 900 Aero) on Thu, 6 Mar 2008 10:47:55
In Reply to: 9000 pistons in 900T16?, Thom, Wed, 5 Mar 2008 23:16:09 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It's been done but it requires crankshaft counterweight modifications and clearancing of the trans for the crankshaft counterweights. You would use a mid year ('91-'93) 9000 2.3 crank. As far as pistons both your 2 ltr 900 and the 2.3 ltr 9000 use the same 90mm bore but the crank / rod combination in the 9000 utilizes a 6mm taller block so you have to go to a custom piston with a shorter pin height. The downside to this besides all of the clearancing is that the 2.3 cranks already require balance shafts mostly because there wasn't enough room to get enough counterweight mass for the increased stroke. Granted an inline crank's dynamic balance Isn't effected by the mass of the counterweights however the more stroke the more mass is needed unless the manufacturer cheats their design by going with balance shafts. We work around this by lightening the crank within the rod journals themselves like you see in after market race cranks. If I were to do another early block 2.3 conversion I'd add heavy metal (tungsten) to the counter weights to make up for the counterweight to trans clearancing of the crank and of course do my rod journal lightening which makes the counterweights think they are in fact heavier. You can't replace your 90mm pistons with 93mm pistons as you wouldn't have any cylinder walls left. You can however use a C-900S '91-'93 2.1 block that is already 93mm as you'll need custom made pistons anyway. For 2.1 forged pistons we've come up with an only plus 3 thousands oversize piston to keep the already thinner cylinder walls as thick as possible for a turbo application. If I remember correctly we used the C-900 rods for this setup. Dave at SPG9
posted by 204.16.14...
, Thu, 6 Mar 2008 10:47:55 <-- Viewing This Message, Thu, 6 Mar 2008 16:28:45
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