×

Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

Newly built engine - no fuel!

Engine Building Fundamentals

Forum Posts

Courses

Blog

Tech Articles

Discussion and questions related to the course Engine Building Fundamentals

= Resolved threads

Author
880 Views

Hi,

I recently re-built my 2JZ-GTE engine and annoyingly I didn't realise I was running on 5 cylinders. Anyway cut a long story short I changed spark plugs today to only find that the 5th cylinder was still brand new and piston still new. No carbon deposits. The issue turned out to be a loose injector adapter.

As this was a brand new engine and done about 500 miles on it, would the 5th cylinder be damaged at all when it wasn't running any fuel/firing?

Unlikely to be damaged. There were OEM engines that disabled cylinders in order to improve fuel ecomomy in low-load situations. It's just drag.

Now your rings on that cylinder may not be seated, a leak-down test would tell you for sure.

I will do a compression test in a few days and see. If my compression is low should I switch back to mineral oil (synthetic at the moment) and break it in? or is it too late for that with around 500 miles on the motor.

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?