Quote:
Originally posted by ae1969
The 86' turbo has a 8 to 1 compression.
ANd the 86 NA has a 9.5 to 1
?
Questions:
1. Is the head of the turbo that much different? I thought they were virtually the same except for some of the coatings on the valves? If someone has a couple of heads laying around, humor me and do a few measurements.........
2. Are the pistons the same size? Height?
3. I want to retrofit the turbo head and the turbo pistons on to my NA. (You are probably figuring out why). Will this drop my compression to the 8:1 range? I am assuming the stroke and bore sizes are the same.
My understanding is that If I swap the head and pistons I will drop the compression of my engine.
Thanks
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1) Turbo head uses different valves (exhaust are hollow, sodium filled), and exhaust ports are ceramic lined. I'm not sure if the valves are the same size or not.
2) Yes. But, turbo pistons are dished. Also, turbo pistons are forged instead of cast.
3) Bore and stroke are the same. Changing to turbo piston will lower your compression.