Euro M30B34 compression numbers?

[rblongboarder]

I've located a source with several euro 10.5:1 m30b34 engines, and I'm considering buying one.

What are good compression numbers for this euro engine?

 

[rblongboarder]

Ahh...

A

Thread 'compression numbers'

Jan 14, 2014

after searching, i didnt find a dedicated thread to this, so thought would start one.

Q: what should the compression be on a 3.5 with stock cam and pistons? The bluebook says (for a 3.0 obviously) 142-156 psi - another book i have on '88 535 says same - 142-156.

Sven and I did (dry) compression tests on our cars today, mine were 148-152, his were 175-185. we thougt our motors were basically the same (although mine has more miles) but guess not.

what should the numbers be?

• alanmcg
• Replies: 15
• Forum: E9 Projects and Restorations

 

[rblongboarder]

Here we go:

Post in thread 'compression numbers'

Jan 16, 2014

M30 b35 engine will test at 180
M30 b34 euro 10:1 engine will test at 200
M30 b34 8:1 engine will test at 155
M 90 9.3: 1 engine will test at 185

There are only a few cams for us
K euro cam 264
M us smog cam 260
3 forked cam 272
The ones like the b,h and others are simply variations.
I have done dozens of tests on dozens of big six engines ( stock) own 3 testers.
There are no early heads on late engines you can't have a b35 with a 1986 casting date.
Alan there is a b35 engine at the yard 36 miles from Sven.
It is 1/2 off this week. 150 bucks.........

• sfdon

• 

For euro m30b34 I'm looking for 185-200...

 

[RichenFamous]

Good to know 180 is my target number!