GordonMasson 128 Posted September 7, 2018 Report Share Posted September 7, 2018 Hi Folks, Despite having my S1 engine rebuilt a couple of years back and having only covered a few hundred miles in it sounds really rough. Can someone confirm the exact way of doing a compression test on the engine.... is it throttle open or closed etc etc. Also, I am sure there used to be a workshop manual for Full Forum Members on here.... Can never find it though, anyone got a link to it? Thanks Quote I've had a perfectly wonderful evening, but this wasn't it. Groucho Marx http://www.thelotusforums.com/latest-news/our-news/lotus-esprit-first-and-last/ http://www.corgi.co.uk/lotus-esprit-s1-chassis-0100g-the-first-production-esprit-signal-red.html Link to post Share on other sites
andydclements 813 Posted September 7, 2018 Report Share Posted September 7, 2018 Throttle open. In an ideal world, it would be a warm engine so as to get the real-world readings once everything has expanded to normal size, but I doubt many people bother. Just disconnect the dissy king lead, remove all plugs and then test each cylinder in turn. 1 Quote Link to post Share on other sites
gvy 384 Posted September 9, 2018 Report Share Posted September 9, 2018 Cilinder compression test Let the engine warm up , doing a small trip. Let it cool for at least half an hour and do the check.Dont do it when the engine is really hot. Unplug the Low tention wires at the HT bobin ( dont let it build up tension inside) Take all sparkplugs out. Open the trottle complete and block it . Never measure with closed throttle because readings are worthless. Start the test: Do the test with a fully loaded strong battery to have correct readings. Note the following for each cilinder first turn of the engine (how far does the meter jump) All cilinders should jump to about the same value after one turn. end reading after a couple of turns = max compression All readings should be in the same region. If one cilinder is down it can be: cilinder ring a valve is not shutting down well test this by squirting a bit of engine oil in the cilinders and do the test over. If the readings go up significant, the cilinder ring is bad. The oil closes this and compression goes up. If it is a valve the reading will stay low.s or If two ajacent cilinders are down ( fe cil 2 and 3) , there can be a torn in the cilinderhead between the two cilinders or in the head gasket Cilinder leakdowntest This test is done with the engine not running and with each cilinder in top dead and the two valves closed. It can also reveal al sorts of engine conditions. Geert Quote Link to post Share on other sites
GordonMasson 128 Posted September 10, 2018 Author Report Share Posted September 10, 2018 Thanks guys. The car has been sitting for the best part of a year without running.... stuck piston ring perhaps? Having said that, Lotus Bits did a full rebuild on the engine about 1000 miles and its always been noisy ... sounded tappity to me but they said although it "sounded horrendous" it was possibly due to one a combination of the carbs needing to be rebuilt and the tubular rather than cast exhaust manifold?? Smells a bit humy when running too.... not sure why that would be on a rebuilt engine? Quote I've had a perfectly wonderful evening, but this wasn't it. Groucho Marx http://www.thelotusforums.com/latest-news/our-news/lotus-esprit-first-and-last/ http://www.corgi.co.uk/lotus-esprit-s1-chassis-0100g-the-first-production-esprit-signal-red.html Link to post Share on other sites
Bibs 11,659 Posted September 10, 2018 Report Share Posted September 10, 2018 On 07/09/2018 at 12:29, GordonMasson said: Also, I am sure there used to be a workshop manual for Full Forum Members on here.... Can never find it though, anyone got a link to it? We offer the parts manuals mate, not the workshop ones sadly. Quote 88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport Evora NA For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. Link to post Share on other sites
GordonMasson 128 Posted September 10, 2018 Author Report Share Posted September 10, 2018 1 minute ago, Bibs said: We offer the parts manuals mate, not the workshop ones sadly. Thanks Bibs... that might just be why I cant find it then.... doh! Quote I've had a perfectly wonderful evening, but this wasn't it. Groucho Marx http://www.thelotusforums.com/latest-news/our-news/lotus-esprit-first-and-last/ http://www.corgi.co.uk/lotus-esprit-s1-chassis-0100g-the-first-production-esprit-signal-red.html Link to post Share on other sites
gvy 384 Posted September 11, 2018 Report Share Posted September 11, 2018 Gordon, Without actual hearing the engine, I can't have an opinion on what to search for. I too have a tubular manifold, without the mid muffler and my exhaust note is pretty loud. But that doesn't mean the engine turns lumpy. If f.e. the carbs are not syncronised and there is a vacuum leak somewhere, then one cilinder will under perform and that would be very noticable at idle and result in a lumpy idle. First you should check the health of your engine : by doing a compression test and may be a compression leakdown test. If all is well after that test, you should concentrate on the carbs. -Are they clean, new gasket set etc..... set the fuel level in the barrels syncronise the carbs and check if you dont have a vacuumleak somewhere. In the case you do, you wont be able to sync them, so you will know. Quote Link to post Share on other sites
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