cute wee gem Posted February 26, 2007 Share Posted February 26, 2007 I'm having some problems with getting this engine to go. Its got quite a big cam so I think this could be half the problem. So far with the ignition timing I've gone right across the range of static timing, extreme amounts of advance (low compression due to cam) and even retard. When its set to quite a lot of advance it coughs and sends smoke back through the carb, I thought this may be a problem with the cam timing. Its currently set to around 3-4deg retarded (It was meant to be advanced, but the engine was upside down when I set it, so I think I buggered that up ) I think Gaz got an adjustable cam gear at some stage, so hopefully you or anyone else who has had experience with it can shed some light. I'm thinking that if the cam timing is retarded it makes it more usable up in the higher revs and may not help starting if the battery won't let it wind over fast enough. I also had a thought that if its retarded (even if its only 3-4deg) the inlet valves are closing a lot later and since the timing is so advanced its firing when the inlet is still slightly open? (smoke out carb) I may be blowing things out of proportion though. Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted February 26, 2007 Share Posted February 26, 2007 you timed it to TDC on the correct cylinder? i.e, checking which valves are closed on pot 1 or 4? adjustable camwheels will make a difference, or, get it centrelined to spec. hardcore cunts can shim the keyway to give advance/retardation on the stock gears. tried moving the dizzy through the range whilst cranking? Quote Link to comment Share on other sites More sharing options...
peteretep Posted February 26, 2007 Share Posted February 26, 2007 it can be on 180 degrees wrong? Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted February 26, 2007 Author Share Posted February 26, 2007 Yes its timed correctly and yes I've moved the dizzy while cranking Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted February 26, 2007 Author Share Posted February 26, 2007 Its not wrong, I'm not that dumb Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted February 26, 2007 Share Posted February 26, 2007 it can be on 180 degrees wrong? yeah, boe. can be as simple a mistake as hvaing #1 plug lead on number 4 etc etc.... If it were me i'd check everything was as right as possible and try tow starting the cunt hah Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted February 26, 2007 Author Share Posted February 26, 2007 Yeah, we're gonna tow it tomorrow, prob get a few more revs than a crusty starter motor, may be enough to get her going But yuh, theres spark, gaps etc all good, its timed right and there is gas, its just not going, but as I said before cam timing + not enough revs to crank it up is probably the problem If towing doesn't work, or it does but it won't start off the starter motor I'll goto the cam timing.. only prob with mini's is its fucking shit to get to it being so crammed in Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted February 26, 2007 Share Posted February 26, 2007 you'll be better off tearing the whole engine back out... don't tow it to high revs til you get it running.... chuck it in like 3rd at about 25-30 kph or some shit boe Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted February 26, 2007 Author Share Posted February 26, 2007 you'll be better off tearing the whole engine back out... Fuck that But yeah as you said, just need to get enough revs (500-800 or so) to get it to crank over faster than the starter motor and hopefully start it, will play with ignition timing at the same time Quote Link to comment Share on other sites More sharing options...
thminiman Posted February 26, 2007 Share Posted February 26, 2007 had this problem too, still do really, lol 1st problem, plugs: did you gap them properly stz? also, when i started my engine up for the first time (well, tried) i did heaps of fucking round with timing/air/fuel etc, by which time the plugs had attracted a fuckload of carbon, maybe check them again... my points where fucked my condesor was fucked. my carbs are way out of sync, fucken hard tog et right btw... have you fixed that vaccum leak on the inlet manifold? my tappets clearances are shit. also, might sound NEWB as, but are you 100% certain you put the clutch/flywheel on the right way, ie, not 180 degrees to where it should be, last time i had my clutch apart i remember i was pretty close to putting it back together the wrong way, although im not sure weather the lock nut is keyed so you cant do that... Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted February 26, 2007 Share Posted February 26, 2007 there should be timing marks on the fornt pullety too, to take reference from Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted February 26, 2007 Author Share Posted February 26, 2007 Flywheel is actually on the wrong way, as I put it on when I had no head on, and didn't bother to look at the cam Doesn't matter though right? - I made sure the dizzy is in the right way by getting #1 at TDC on compression stroke No marks on front pulley, I'll just do it by ear/trial and error Plugs are gapped right, I've taken them out heaps as it got flooded a few times etc so they are fine, decent spark there too so condenser/points should be fine, they look brand new too I've put the single carb back on thinking it may be a fuel prob with the twins, still got nothing untill I took out the rather large oil pressure sender, and put the stock one back in (had a oil gauge set up) because it was hitting the dizzy and couldn't get fuck all advance going, once I done this I got smoke out the carb on a few occasions, dad reckons he heard a bang out the exhaust at one stage also, with the timing in the same spot we couldn't get it again.. talk about confusing Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted February 27, 2007 Share Posted February 27, 2007 Flywheel is actually on the wrong way, as I put it on when I had no head on, and didn't bother to look at the cam Doesn't matter though right? Depends on the balancing. It's ususally wise to keep flywheel/pressureplate aligned and depending on the engine keeping them reletive to the crank. It wont cause it not to star tho. - I made sure the dizzy is in the right way by getting #1 at TDC on compression stroke How did you confirm this? I've put the single carb back on thinking it may be a fuel prob with the twins, still got nothing untill I took out the rather large oil pressure sender, and put the stock one back in (had a oil gauge set up) because it was hitting the dizzy and couldn't get fuck all advance going, once I done this I got smoke out the carb on a few occasions, dad reckons he heard a bang out the exhaust at one stage also, with the timing in the same spot we couldn't get it again.. talk about confusing I can tell you from experiance that if you get the timing 180 out it will back fire. Advancing or retarding will move the back fire from out the carb to out the exhaust or vise versa. For the few seconds it's going to take I'd move the leads 180 as it will either fix it or confirm that firing order isn't the problem. Quote Link to comment Share on other sites More sharing options...
lowlancer Posted February 27, 2007 Share Posted February 27, 2007 Ahhh I had similar probs Firstly had dizzy out 180, would do fuck all. Just moving it when in the wrong position won't make a diff Replaced coil, cap, leads, basically everything. Even if I didn't HAVE to it was worth it. Quote Link to comment Share on other sites More sharing options...
nismo.capri Posted February 27, 2007 Share Posted February 27, 2007 Replaced coil, cap, leads, basically everything. Even if I didn't HAVE to it was worth it. Good advise! ...I always try to get people to do rotor, cap, leads and plugs with a "new" car... you never know when they were last done. Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted March 1, 2007 Author Share Posted March 1, 2007 Got it kinda sorted out now, fixed cam timing (was out more than expected) and a few other niggly bits. Should have it started tomorrow Quote Link to comment Share on other sites More sharing options...
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