right all being offered an xr2 head to replace my tired rs turbo head.can i swop these or doi need another rs head or are all cvhsthe same?need to know asap cheers all

 

i think i red on here there the same but cant be sure..maybe depends on mfi efi

 

been looking onto it they are different but i wanna know if the loss of compression will allow the car to run and well?
mines mfi and im after the lean burn head with hopes of it running the rs very well.just wanna know if it bolts on and all will run well

 

duz work mate.i used a xrs head on my s2 and it made 186bhp.u cant use efi tho

 

lovely so the lean burn head will work on the rstseries2 engine with no problems at all?

 

yep did on mine mate

 

sound mate cheers for that

 

NO NO NO, the lean burn head will raise the compression, so not good for an RS turbo.

 

most s2 heads have bin skimmed to death anyway mate.mine worked perfect at 15psi

 

You CANNOT use the lean burn 1.6cvh head on a std RS turbo bottom end. This is because the std RS turbo has a 2mm piston protrusion at TDC above the deck height. The head gasket is only 1.5mm thick, and hence if you fit the lean burn head to a std RS turbo bottom end, the pistons will make heavy contact with the combustion chamber "beak" resulting in horrendous noise and bent con-rods!!

A second issue is the high compression ratio this results in, but that is insignificant in comparison to the 1st problem!!!!!

 

listen to karl he knows his stuff

 

cheers carl exactly what i was lookin for cheers

 

The XR has a head identical to the RS turbo and not the lean burn variant as fitted to carburettor models from -86.

 

Hi Karl looking for a little help here. Going to double check everything but getting 1.5 mm taken off me pistons crowns to give me a CR off 8.6:1. My head has been skimmed a lot and turned out at 48.5cc. Do you think I will have enough squish clearance? I have enough piston to valve clearance I think ( around 2mm ) just worried about my head hitting pistons. Valves are only about 1mm deeper than the face off the head as been skimmed that much.

 

This is an 8yr old thread and Karl is fairly inactive on here now.
Better to start a new topic in the RST room - plenty of knowledgable folk about to answer.

 

Ok thanks haz