Yellowgt4 Posted July 31, 2014 Share Posted July 31, 2014 Does that make a big difference? And the fact I left 5 plugs in whilst doing each cylinder? I think I'll redo it today. Quote Link to comment Share on other sites More sharing options...
Yellowgt4 Posted July 31, 2014 Share Posted July 31, 2014 I mean the throttle, would that make up 20psi? Quote Link to comment Share on other sites More sharing options...
Yellowgt4 Posted July 31, 2014 Share Posted July 31, 2014 And another update! So done my compression test with all plugs out and wot. 125psi on all cylinders. Bad news applied some oil and it shot up to 300psi! So I'm guessing that'll be the rings shot then? Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted July 31, 2014 Share Posted July 31, 2014 The video I seen on YouTube said to put a little bit of oil in before you do it anyway.another one says you have to run it a little first.or possibly a faulty gauge? Where are you located? Quote Link to comment Share on other sites More sharing options...
Yellowgt4 Posted July 31, 2014 Share Posted July 31, 2014 Yeah I used a different gauge this time just incase. I followed this Measurement of Compression Pressure 1. Warm up engine. 2. Turn ignition switch off. 3. Release fuel pressure (See How to Change Fuel Filter) 4. Remove all spark plugs. 5. Disconnect distributor center cable. 6. Attach a compression tester to No. 1 cylinder. 7. Depress accelerator pedal fully to keep throttle valve wide open. 8. Crank engine (let it turn over 7 times) and record highest gauge indication. 9. Repeat the measurement on each cylinder as shown above. Note: Always use a fully charged battery to obtain specific engine revolution. Compression Pressure kPa (kg/cm2, psi) / RPM Standard = 1,236 (12.6, 179) / 300 Minimum = 1,040 (10.6, 151) / 300 Difference limit between cylinders = 98 (1.0, 14) / 300 10. If cylinder compression in one or more cylinders is low, pour a small amount of engine oil into the cylinders through the spark plug hole and re-test compression. * If adding oil helps compression, piston rings may be worn or damaged. If so, replace piston rings after checking piston. * If pressure stays low, a valve may be sticking or seating improperly. Inspect and repair valve and valve seat. * If compression in any two adjacent cylinders is low and if oil does not help compression, there is a leak past the gasket surface. If so, replace cylinder head gasket. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 31, 2014 Share Posted July 31, 2014 (edited) And another update! So done my compression test with all plugs out and wot. 125psi on all cylinders. Bad news applied some oil and it shot up to 300psi! So I'm guessing that'll be the rings shot then? Something not right there, adding oil should not suddenly increase compression from 125psi to 300psi. that way over std. How much oil did you add? Edited July 31, 2014 by Tricky-Ricky Quote Link to comment Share on other sites More sharing options...
Yellowgt4 Posted July 31, 2014 Share Posted July 31, 2014 To be fair quite a bit dripped in and when I put it back together there was a lot of smoke that needed burning off with a swift drive. Can anyone help with a price of a rebuild? Quote Link to comment Share on other sites More sharing options...
Yellowgt4 Posted July 31, 2014 Share Posted July 31, 2014 When I say add oil I meant down the plug tube Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted July 31, 2014 Share Posted July 31, 2014 something doesnt seem right here. like ricky says, 125 to 300 is quite a difference. is that guide for a vq engine? it just seems weird that all cylinders are so low, what kind of mileage has it got on it? by rebuilding the engine would you want to forge it or standard parts? where are you located? Quote Link to comment Share on other sites More sharing options...
Yellowgt4 Posted July 31, 2014 Share Posted July 31, 2014 It came from the nicoclub forum iirc. I did put quite a lot of oil down the top so it's probably over pressurised it. It's done 98500 miles. I'm in falkirk scotland. I'd like to forge the engine but the best price would need to suffice 😞 Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted July 31, 2014 Share Posted July 31, 2014 I've got a compression tester u can get a shot of to try if u want. I'd even give u a hand. I'm just outside alloa Quote Link to comment Share on other sites More sharing options...
brians25 Posted November 27, 2014 Share Posted November 27, 2014 Falkirk, contact Jem engines on the polmont road, top builders and blueprint specialists Quote Link to comment Share on other sites More sharing options...
brians25 Posted November 27, 2014 Share Posted November 27, 2014 http://www.jemengines.co.uk/ Quote Link to comment Share on other sites More sharing options...
zippypooz Posted November 27, 2014 Share Posted November 27, 2014 Just take an xyz HFC y pipe with you, bout £500, designed for de cats!!...it has its own cat I believe. Quote Link to comment Share on other sites More sharing options...
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