porsche 944 turbo engine block

[rickware]

hi, can anyone recommend a good supplier of engines for my porsche 944 turbo. i have made a lot of mods and it is 280hp at moment but it should be a lot more. seems like the bores and rings are worn as it only has 100psi in 2 of the cylinders and 15o psi in the other two and anymore boost i put through than 1 bar just blows more oil out the exhaust without horsepower gain. it runs fine all be a bit laggy at bottom rev range but burns a litre of oil every 100 miiles on a track day and every 400 on road. i think it is time to change the block or rebuild the one i have so after some advice on where i should go. i probably can change the block myself but rebuilding it i think i will leave to someone else. also i am thinking i might go bigger whilst i have to do this job and heard of 2.7 and even 3 litres that can be made for the turbo. what do people recommend?
the cylinder head has been rebuilt in the last 5k so i don't think it is the valves or stems and i have a rebreather chamber to reduce the crank pressure so this is why i am thinking rings and bores.(it has 150k and the last 20k have been nurburgring trips and track days)
thanks

 

[jackregan]

try simon peckham of sps, or capricorn - used to be perfect bore for the block, they do the re coating of the bore thing

 

[DivineE]

+1 for simon SPS. He can have them re-built with Nickasil coated hardened steel liners and lighterweight pistons and rods. I think its basically the future for anyone wanting to extend the lives of these cars. The end result is far stronger, better engineered (in terms of tollerances and design) and far more practical for future part replacement than the original engine (because like other cars the piston rings are softer than the bores so re-builds should only require changing the rings rather than a re-bore of the cyclinders as is required on the auracil bores used by porsche).

Having been in a few cars running these new liners (and owned one) I can say that they feel beautifully smooth, get up to temperature quickly and have so far proved very reliable - this is probably as much down to Simons 'total perfectionist' engine build methods as the quality of the components but the over all quality of the package is second to none.

Failing that or if you don't have that kind of money to spend. Hartech are a very honest company who I have much faith in and 'may' offer another similar solution for less money. - I've seen their work on the first water cooled 911 blocks that suffered from ovaled/ failed bores.