Jump to content
Brandon73fjord

Compression test. Acceptable range?

6 posts / 1406 viewsLast Reply

Recommended Posts

I'm having my engine compression tested. My mechanic wants to k ow what's acceptable for this type of engine. I'm askink for a range in numbers(120-160). Thanks

Share this post


Link to post
Share on other sites
Guest

140done correctly on my tii

Share this post


Link to post
Share on other sites

Consistency within 5% hole to hole is ideal, with 120 to 160 net acceptable as gauges and operators very.

Share this post


Link to post
Share on other sites

valves adjusted cold (0.006")

battery fully charged

hold throttle wide open while cranking

have all plugs removed

compression test 1502 - 2002tii

good = above 10.5 bar (149.3 lb/in)

normal = 9.5 bar (135.1...149.3 lb/in)

poor = below 9.0 bar (128 lb/in) = you need work

test procedure

use calibrated tester,

with battery fully charged,

engine at operating temperature

and throttle fully open.

Turn engine over at starting speed.

Share this post


Link to post
Share on other sites

I guess I know why I have to run super...

172psi on the motor built by BC & Me.

BD

Share this post


Link to post
Share on other sites

engine that came out of my 75... 100 plus or minus 20psi.

engine that went in.....180 plus or minus 2psi

cd's got the correct info, of course, for a stock engine. cam/piston/ring/crank whatever upgrade will cause variance from stock numbers.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.




×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.