Chris! Posted March 30, 2008 Report Posted March 30, 2008 No vibrations since the props been re-balanced . I also have a comfy standard x-member and engine mounts so the engine isn't mounted solid or anything . I have all new bolts , nuts , lock tight , nylocs , washers etc and it's all built and assembled with care . Most of the bits that have worked loose where probably down to the propshaft over the last 500 miles or so but the alternator bolts work loose everytime i drive it . I've just painted the threads with tipex , lock tighted the nyloc nuts and i'm now going out testing in a minute to see if they fall out !!!!!!!! what you need is a nice pre crossflow
Toby Posted March 30, 2008 Report Posted March 30, 2008 what you need is a nice pre crossflow We'll find out at Bruntingthorpe. Although to be fair mine has shaken a few starters and alternators to pieces When mine was shaking alternators appart I got an equivilent design, which was a different shape, with the same fitting and output - designed for a transit I think, I guess it agreed more with the engine harmonics cos the problems of alternators lasting 2 minutes went away then. Could be tyre shake loosening everything on your road going dragster too although you probably get that less on 50 profiles!!
ratman Posted March 30, 2008 Report Posted March 30, 2008 Time to get a drill and lock wire everything every thing on my engine is lock wired and nothing comes loose But then I go out in the rain
oliwally Posted March 30, 2008 Report Posted March 30, 2008 Bolt some weights on the sides of the block,that should change the frequency and stop the vibrations. Although to be fair mine has shaken a few starters and alternators to pieces When mine was shaking alternators appart I got an equivilent design, which was a different shape, with the same fitting and output - designed for a transit I think, I guess it agreed more with the engine harmonics cos the problems of alternators lasting 2 minutes went away then. Could be tyre shake loosening everything on your road going dragster too although you probably get that less on 50 profiles!! Same thing here,either it was heavier or lighter and it altered frequency of the vibrations or the shape dampend the vibrations out.
Toby Posted March 30, 2008 Report Posted March 30, 2008 Here!! Whats happened to my secret font size!! Git
mitomad Posted March 30, 2008 Report Posted March 30, 2008 That Cosworth Duratec that did the load test .. 97 hours screaming its tits off in a dyno ..it didnt come undone .. Ive heard some people talking about this, Have you got anymore details?
oliwally Posted March 30, 2008 Report Posted March 30, 2008 Here!! Whats happened to my secret font size!! Stud muffin no need to keep that quiet
oliwally Posted March 30, 2008 Report Posted March 30, 2008 That Cosworth Duratec that did the load test .. 97 hours screaming its tits off in a dyno ..it didnt come undone .. Ive heard some people talking about this, Have you got anymore details? But a dyno is stationary while in the engine bay its subjected to various loads and vibrations,But,They should stay put whatevery its mounted in. thats the trouble with a lightend flywheel,lots more vibrations from idle till the cam comes alive. This happens quite a bit on the enduro bikes i have,rebuilding them to have much better snap and more like a motocross bikes we were taking out the counter balancer and rebalance the crank assembly to around 70% they suffered horrendous vibration for the first 1/3 of there rev range and would make your hands go numb. we had to add or remove hand guards/sump guards/fill handle bars with silicon and so on. just enough to change the harmonics of the bike.
kevmk2 Posted March 30, 2008 Report Posted March 30, 2008 Time to get a drill and lock wire everything every thing on my engine is lock wired and nothing comes loose But then I go out in the rain So do i sometimes Took it out the saturday before last, nice stretch of road, opened it up, wheelspin in 2nd, 3rd, 4th gear (at 95mph on the road angel) Then put it into 5th gear for the hope of some grip and still wheelspinning What a handful and to be honest a complete waste of time
Toby Posted March 30, 2008 Report Posted March 30, 2008 gear for the hope of some grip and still wheelspinning What a handful and to be honest a complete waste of time Not wanting to sound like a stuck record but have you thought about installing a nice pre-crossflow??!!
Toby Posted March 30, 2008 Report Posted March 30, 2008 Here!! Whats happened to my secret font size!! Stud muffin no need to keep that quiet Sorry I thought it was a secret.
oliwally Posted March 30, 2008 Report Posted March 30, 2008 Here!! Whats happened to my secret font size!! Stud muffin no need to keep that quiet Sorry I thought it was a secret. bugger its out now
yorkester Posted March 30, 2008 Report Posted March 30, 2008 was out checking the car yesterday after he new engine fit and the starter motor bolts just keep coming out. i've got the flu today so my nuts have tightened right up
Guest MK1gaz Posted March 30, 2008 Report Posted March 30, 2008 Just got back from testing the car allday . Had the Mrs in the car (so no more than 4000 revs) and went to Brooklands to see the Minis on show . Cruised down the A3 (all comfy + sedate) and back again , dropped off the Mrs (revs now upped to 9000 ) and then started the proper testing . So far so good , nothings broke or fell off but i will check it all properly tomorrow night ready for the Ace cafe
Guest MK1gaz Posted March 30, 2008 Report Posted March 30, 2008 was out checking the car yesterday after he new engine fit and the starter motor bolts just keep coming out. Mines done that 3 times and the starters then blow themselves too bits on the flywheel
Guest MK1gaz Posted March 30, 2008 Report Posted March 30, 2008 Bolt some weights on the sides of the block,that should change the frequency and stop the vibrations. Although to be fair mine has shaken a few starters and alternators to pieces When mine was shaking alternators appart I got an equivilent design, which was a different shape, with the same fitting and output - designed for a transit I think, I guess it agreed more with the engine harmonics cos the problems of alternators lasting 2 minutes went away then. Could be tyre shake loosening everything on your road going dragster too although you probably get that less on 50 profiles!! Same thing here,either it was heavier or lighter and it altered frequency of the vibrations or the shape dampend the vibrations out. I'm interested in the engine weight thing , anymore info on this please
Toby Posted March 30, 2008 Report Posted March 30, 2008 I know a welder bloke who used to do a bit for Suzuki racing and they would give him a frame to just weld a bolt on "somewhere" as that would concentrate the harmonics to a different area of the frame. Wierd things go on. Are there any other models of your alternator or bracket?
Guest MK1gaz Posted March 30, 2008 Report Posted March 30, 2008 I've got a another one with rubber mounts on it but my new alternator doesn't fit it . There's lots of different brackets to try though . How many alternators did your engine smash before you fixed it ? Just swopping the brackets fixed your problem so perhaps mine will also stop breaking/vibrating loose when i swop brackets then
Toby Posted March 30, 2008 Report Posted March 30, 2008 I've got a another one with rubber mounts on it but my new alternator doesn't fit it . There's lots of different brackets to try though . How many alternators did your engine smash before you fixed it ? Just swopping the brackets fixed your problem so perhaps mine will also stop breaking/vibrating loose when i swop brackets then I did about 5 from memory, untill lucus got bored!! It's wierd mate. little things make a difference you wouldn't expect. Initially it broke the tentioner strap and then the alternators starting failing.
oliwally Posted March 30, 2008 Report Posted March 30, 2008 Bolt some weights on the sides of the block,that should change the frequency and stop the vibrations. Although to be fair mine has shaken a few starters and alternators to pieces When mine was shaking alternators appart I got an equivilent design, which was a different shape, with the same fitting and output - designed for a transit I think, I guess it agreed more with the engine harmonics cos the problems of alternators lasting 2 minutes went away then. Could be tyre shake loosening everything on your road going dragster too although you probably get that less on 50 profiles!! Same thing here,either it was heavier or lighter and it altered frequency of the vibrations or the shape dampend the vibrations out. I'm interested in the engine weight thing , anymore info on this please Find an empty threaded hole in the block,fit a long stud thats lock tighted in. find some washers and a heavy piece of metal,lead would be good,bolt that to the stud,lock tight and double bolt etc and see if it feels better. transits have a bi old weight bolted to the diff carrier for this reason i believe. thats only about 3 or 4lbs
Guest MK1gaz Posted March 30, 2008 Report Posted March 30, 2008 I did about 5 from memory, untill lucus got bored!! It's wierd mate. little things make a difference you wouldn't expect. Initially it broke the tentioner strap and then the alternators starting failing. I've broke my tensioner bracket thing as well , got it welded up the other week . So very similar to your experiances then mate .
Guest MK1gaz Posted March 30, 2008 Report Posted March 30, 2008 Find an empty threaded hole in the block,fit a long stud thats lock tighted in. find some washers and a heavy piece of metal,lead would be good,bolt that to the stud,lock tight and double bolt etc and see if it feels better. transits have a bi old weight bolted to the diff carrier for this reason i believe. thats only about 3 or 4lbs ok thanks , sounds a weird idea but needs must
oliwally Posted March 30, 2008 Report Posted March 30, 2008 Find an empty threaded hole in the block,fit a long stud thats lock tighted in. find some washers and a heavy piece of metal,lead would be good,bolt that to the stud,lock tight and double bolt etc and see if it feels better. transits have a bi old weight bolted to the diff carrier for this reason i believe. thats only about 3 or 4lbs ok thanks , sounds a weird idea but needs must glad you understood that. superbike owners do that when they've been tinkering with the shocks and engines,they add heavy old bar ends to stop the vibs sending there hands numb. yamaha started welding boot struts to their race bike frames in MotoGP to stop the thing from chattering,same cause,the bikes vibrating at a silly rate,different end result. they even tried going back to twin shock set up to help. they ended up taking welds out of the head stock and giving the swing arm more flex to change the frequency.
mk2dk Posted March 30, 2008 Report Posted March 30, 2008 Hi mk1gaz are you using stainless steel bolts, because they tend to come loose if they are warm/cold. Think it´s because stainless expands different than ordinary steel when exposed to heat
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