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I'm thinking of mild port and polishing my 944 turbo head?

Thanks to you both, and phill it really wasn't out of choice about the bottom end it was something that I didn't have much choice about it as a liner was split, pistons where damaged and the x2 of the conrods had odd numbered bottom caps that John at serdi wasn't cinvinced would be a good idea to reuse. So that's why I've had to do all I've done to the bottom half, but such is life and it is good investment for the future as I'm smitten by my turbo and don't long for any other vehicle so I know its worth doing.

Im not yet at the stage to splash the money on another stand alone or maff or turbo but I know that they are the next on my list for performance.

I woukd just like the rebuild to go to plan and to be able to run the car and enjoy it for a bit before I decide to go to the next level. Let's face it though it's always about the money as if I had a chunk given to me to spend on myself it would be the first thing I would want to treat myself to.
 
Hi Phil

Wayne is 'up north' used to be Rochdale but wouldn't swear to it today, he may even be here right now, he did say that (iirc) he was requested to help Porsche (i think Reading) with some technical issue...As for what he knows re VEMS, I have no idea, I would assume he knows a lot as it's his field, I'm sure that he must have come across it a number of times as it gets more widely used. I am also very confident that he could not only build the VEMS himself but probably give it more options too..When he last mapped my car he had just finished building an ECU from scratch after spending most of the night trying to get a 600bhp rally car running properly that was needed the next day, he gave up on the supplied ECU and built another...this is one of the reasons that I only use Wayne, the others are the two maps that he's done for me and the winning cars in various race championships that he's mapped and I had followed. I discovered Wayne after learning that he was the guru race preparing 'Chris Heeley's 951 for the Pirelli championship when he worked for 'Redline'. BTW the first time I met him, he drove down to Pinewood Studios for me with a race 911 on a trailer ready for a Brandshatch meet that weekend. Unloaded the 911, hitched up my car and took it to 'Power Engineering' in Uxbridge to hire their dyno for the time required, this was over 15 years ago...how time flies...:)

cheers

Pete
 
It's easy to be wise after the event, but if I was rebuilding a 2.5 engine I'd definitely go the offset ground crank, mitsi rods, iron liners, JE piston route. I wouldn't use a Lindsey head either when there's at least a couple of guys in this country that are more than capable. Ask your son about a head guy called Nick Waples Pete.
 
There have been a few examples of people honing the stock intake and even with supposed comprehensive cleaning, something was missed. Got in the motor and made a mess of things. A bit of mild work on the head won't make a ton of difference until you really start to increase valve sizes and introduce larger cam. If you were going down that path then I'd suggest making up a different intake altogether. However having said that, we saw just over 500whp with a stock intake. Made very good improvements by making up our own new intake though. About 30whp at 20psi. You shouldn't have to send your head to LR if you did want to have it improved. Generally while very helpful, they don't do much if any engine work themselves. They contract the work out. You can surely find someone in the UK to do a good job?
 
333pg333 said:
There have been a few examples of people honing the stock intake and even with supposed comprehensive cleaning, something was missed. Got in the motor and made a mess of things. A bit of mild work on the head won't make a ton of difference until you really start to increase valve sizes and introduce larger cam. If you were going down that path then I'd suggest making up a different intake altogether. However having said that, we saw just over 500whp with a stock intake. Made very good improvements by making up our own new intake though. About 30whp at 20psi. You shouldn't have to send your head to LR if you did want to have it improved. Generally while very helpful, they don't do much if any engine work themselves. They contract the work out. You can surely find someone in the UK to do a good job?
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Hi and thanks for your comment, just got a question?

When you say people have tried honing there intakes and cleaning but something was missing, could you explain what you mean

thanks
Daniel ??
 
I've read about some of the abrasive used being left stuck in the manifold, and then coming loose when the manifold is fitted. The abrasive then did a job on the inside of the engine.

 
blade7 said:
I've read about some of the abrasive used being left stuck in the manifold, and then coming loose when the manifold is fitted. The abrasive then did a job on the inside of the engine.
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Yes this story is amplified and does the rounds more than it should do, (a turbo application many years ago in the USA) and not several instances that it warrants putting people off.
My manifold was submersed in acid for a few hours and also checked with an endoscope.

It's a process that creates a performance benefit so good housekeeping and checks are all that's required.

R
 
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