no compression at 900 miles

Reply Subscribe

Thread Tools

Search this Thread

Apr 10, 2005 | 09:47 AM

Mo_Spec

Thread Starter

Honda-Tech Member

Joined: Oct 2004

Posts: 209

Likes: 0

From: arvada, co, usa

no compression at 900 miles

i have a 3rd gen with a built b20 new rods pistons etc... i broke it in for 800 miles and was pulling 18 inches of vaccum on decel. so i started boosting 7 pounds. 3 days later 90psi compression on all four cylinders. wasnt running lean 550cc injectors & FMU. what could have caused this ???

Apr 10, 2005 | 11:15 AM

LudeyKrus

Member

Joined: Oct 2002

Posts: 4,768

Likes: 1

From: Flowery Branch, Ga

What were your original compression test numbers?

We have no really good numbers to compare.

Apr 10, 2005 | 11:17 AM

PrecisionH23a

Honda-Tech Member

Joined: Mar 2002

Posts: 14,296

Likes: 1

From: Charleston, SC

Re: no compression at 900 miles (Mo_Spec)

How do you know you were not running lean? Did you pull your AF's via wideband 02? You do realize that by running 7psi on a stock ECU you were running ZERO degree's of timing retard. My guess is the advanced timing fried your pistons, egged your cylinder walls, or blew your headgasket.

FMU = garbage