It's really nice to get involved in an engine that is not complicated and easy to build.
We supplied a customer with all of the parts and machining required and now we are doing the assembly. This was not planned, but we are helping the shop building the car by doing the assembly work. This is finally a fun build.
This is a 2.9L build on a 73 911T/S base engine. It will be interesting how this engine performs.
Mag case, 70.40mm stroke stock crankshaft, the rest our stuff. The crank went through all of the typical upgrades so nothing new there.
The case was narrowed and line bored by a well know shop but it had issues after 2 attempts, so we got involved and line bored it 1st O/S and straight. I'm not a big fan of the narrowing cases.
This build is a follow on from the 2.8L engine we did for Jeff in Australia. It uses our long lightweight steel top guided rods, Mahle bridged pistons with small pins and short compression height. The goal here was to lighten up the masses that move. Its fitted with one of our Crankshaft dampers to help with the secondary imbalance these engine have. The longer rod helps the gas exchange over the top but as the masses involved have a new amount of acceleration to mid stroke, the forces are increased. You don't get anything for free with engines.
Heads are not to radical and the engines displacement and smaller chamber limits valve size and port size. This is a street engine so response is very important. Would be a waste of all the lightening of the masses, if we made the cylinder head flow all wrong.
Cam is one of ours and we are using the new billet adjustable rocker arms.
So far the engine is going together one side at a time, as we are checking a few things. This came to use partially assembled so we are doing our due diligence to make sure all is correct.
I will post more photos tomorrow of the progress and of the parts we are using.
