celal

is it safe to use 11.5 cr on 964 engine with european 97 octane?

NineMeister

Stock engine measures 10.6 to 10.8, RS engine slightly higher, so 11.5 with stock cams is definitely pushing the envelope. My guess is that the engine would cope but you may want to consider a remap to reduce the timing rather than relying on the knock control.

If you are using a longer duration sports cam you can definitely push the comp up to 11.5 but you would not want to go any higher unless you had well designed pistons which control the burn shape of the combustion space.

celal

I am planing to use motec m48 so I wont have knock control

NineMeister

So why 11.5:1??

Geoffrey

The 9M USA #2 car was 11.7:1 compression with 91 octane US fuel and an M48 so I would think you would be fine over there with what you plan to do.

celal

I've already bought a lot of stupid parts and spent to much money, my mechanic went to another country so I dont know what to do
part list
105 mm nikasil p/C 11.5 CR from ln engineering
carillo rods
gt3 oil pump, and all the engine hardware ...etc . I dont know what to do?because of living in turkey its very difficult to find a good mechanic who knows about aircooled porsche

celal

Dear Geoffrey if you remember me ,I send you a mail about buying a complete 9m package, you made a part list except motec m48 which I have already and you told me its better to contact with colin but I coundnt reach him I send 4 mail but I didnt get any reply

NineMeister

Sounds like our spam filter being over-effective.

Take it as read that we will try to help you out as much as we can, however from the shopping list that you have I would think that the only solution will be to send the parts to us for the build. If you want to discuss the project call Peter in our office on +44 1925 242342 and he he can't answer all your questions ask him to root me out of the workshop (but be warned that this is a very busy month for me so I may not be immediately available - like if I'm on the dyno).

celal

Dear Colin,
my plan was to sending my engine to your company for a complete rebuilt but when I talked to custom They told me that I have to get permission from the industry ministry When I contacted with them they told me that I could do that unless if we dont have authorized porsche service in turkey so this is not option anymore my only chance to buy the right components or to find a person who will come to istanbul and rebuilt the engine for me

race911

Just thinking outside the box here, but couldn't you "sell" your parts to a third party and then "buy" a complete engine from Colin? Even if it had to have a different serial number on the engine. I get that it's a pain any way you look at it, however with the amount of money you'll have invested in this project I'd make every effort to have an industry expert get the job done.

celal

I cant buy a used engine custom will not give permit it must have invoice from the factory we have such a stupid law in turkey