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Feb 21, 2011 16:28:18 GMT
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hi all. after having unimaginable trouble with trying to find an sd1 v8 manual flywheel (yep tried p6, tvr and ldv) i have decided that maybe it might be better to skim some off the range rover flywheel
(some read 5mm)
is 5mm taking the pee? will it explode and send my tunnel into my shins? or will it be fine? has anyone else done this at all?
i need to at least get this stage together and then my mojo will be a rolling inferno!
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Feb 21, 2011 19:13:43 GMT
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Whats the original weight of the flywheel and what is your target after removing 5mm ?
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Feb 21, 2011 19:39:14 GMT
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mores the point, what thickness is it currently and what will the minimum section be after machining? you may need to draw it out on CAD or accurately on paper to get the true picture.
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Feb 21, 2011 22:05:03 GMT
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no the skim isnt for weight reduction, its for trying to get the clutch flywheel and clutch cover in the rwd lt77 bellhousing. at the moment it catches it a bit
5mm ought to bring it down.
nobody has ever ever tried this?
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Feb 22, 2011 12:17:38 GMT
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To save me starting a new thread, and to bump yours.. Is there much benefit reducing the weight of a flywheel on a road car? It's all going to be apart anyway so it's an ideal time to give it a tickle. This is considerably smaller than than a Rangey V8 one though, my STARTING weight would be around 6 kilos on a Fiat FIRE engine.
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...proper medallion man chest wig motoring. |
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Feb 22, 2011 12:38:48 GMT
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I would take it to someone who has done flywheels before, or can look at it and say for sure that there will be enough meat left on it that it will be safe. Flywheels cause massive very dangerous damage when they let go, so you want to be 100% sure in your mind that it is ok to do so. To save me starting a new thread, and to bump yours.. Is there much benefit reducing the weight of a flywheel on a road car? It's all going to be apart anyway so it's an ideal time to give it a tickle. This is considerably smaller than than a Rangey V8 one though, my STARTING weight would be around 6 kilos on a Fiat FIRE engine. No benefit at all, other than making the revs flick up faster. On a standard engine you'll need more revs to pull away, it'll be harder to pull off on a hill and it'll probably make the engine rough when it's idling. All depending how much you take off, of course  (I say do it ) |
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Feb 22, 2011 12:43:25 GMT
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Maybe a little - especially if you have a very lumpy camshaft. In the lower gears a surprising amount of the engine's power goes into accelerating the flywheel - consider how long it takes to rev up to the red line with no load, and compare it to the time taken to the red line in 1st gear. If you have a lumpy cam a lighter flywheel can allow the engine to get into the power band sooner.
However, in traffic it would be a nightmare - since the engine has less inertia, pulling away needs more revs.
Personally, for a daily I wouldn't (and didn't) bother. For a hooning machine I probably would.
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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flywheel uber skim??sowen
@sowen
Club Retro Rides Member 24
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Feb 22, 2011 13:09:31 GMT
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hi all. after having unimaginable trouble with trying to find an sd1 v8 manual flywheel (yep tried p6, tvr and ldv) I have decided that maybe it might be better to skim some off the range rover flywheel (some read 5mm) is 5mm taking the pee? will it explode and send my tunnel into my shins? or will it be fine? has anyone else done this at all? I need to at least get this stage together and then my mojo will be a rolling inferno! I've got a spare flywheel that I'd be willing to swap for the range rover one if you're interested? It needs re-facing as the clutch face is a little worn. |
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with regards to the FIRE engine skim, look at the 750mc website. people there use the 998 for the cars now as the austin engines are stupidly rare now. i used to have an uno and you can port them to the size of an old 50p theres that much material. just make sure the gaskets and manifolds match.
now then, back on track
yes i will swap but it must only need to be refaced due to an iffy face profile rather than any surface cracks. cracks in flywheels scare me
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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flywheel uber skim??sowen
@sowen
Club Retro Rides Member 24
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There's a few small surface cracks on it, not as bad as another one I had re-faced, but they're there. I can take a couple of close-up photo's if you want, up to you  |
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please yes that would be great. does it cost much to get them refaced?
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Steve
Posted a lot
Making progress in small, easy to handle chunks of awesome
Posts: 2,030
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Feb 23, 2011 10:23:36 GMT
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With regard to an uber skim of a apparent sound flywheel with plenty of meat on it I can see a problem The standard flywheel fitted to my 2.0 DOHC in the Viva needed around 15-17mm taken off it so that I could use the Type9 g'box, a friend did the skim for me and after the few thousand miles ive used the car, ive had no issues with it whatsoever If you get really stuck for a SD1 flywheel, I have one here that was lightened some years ago that I might let go Edit: Might i just add, the DOHC flywheel as standard is MAHOOOSIVE and still had a good 10mm of meat that i could lose without compromising strength |
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Last Edit: Feb 23, 2011 10:25:38 GMT by Steve
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Feb 23, 2011 10:24:06 GMT
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PLEASE DO NOT MJOR MACHINE STANDARD CAST FLYWHEELS !
Your just asking to have major parts of your anatomy cut off by flying debris,
After a material has been cast, and machining work seriously reduces its tensile strength and induces stress fractures. resulting in x kg of 5krpm mass flying apart.
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Feb 23, 2011 11:04:49 GMT
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normally i would never consider it BUT the rangerover flywheel appears to be made the old english way. take an sd1 flywheel and make it thicker and heavier.
this is why I'm asking if anyone has done it specifically to a range rover one....
i wouldnt dream of it usually. i hear its akin to a grenade going off in terms of frags and the penatrative power.
sleeperviva - if i thought your flywheel was cheaper than taking metal off m ine i would seriously consider having it lol.
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bstardchild
Club Retro Rides Member
Posts: 14,917
Club RR Member Number: 71
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flywheel uber skim??bstardchild
@bstardchild
Club Retro Rides Member 71
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Feb 23, 2011 12:25:15 GMT
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Maybe a little - especially if you have a very lumpy camshaft. In the lower gears a surprising amount of the engine's power goes into accelerating the flywheel - consider how long it takes to rev up to the red line with no load, and compare it to the time taken to the red line in 1st gear. If you have a lumpy cam a lighter flywheel can allow the engine to get into the power band sooner. However, in traffic it would be a nightmare - since the engine has less inertia, pulling away needs more revs. Personally, for a daily I wouldn't (and didn't) bother. For a hooning machine I probably would. All depends on the engine - I went from 18 kgs to 6.5 kgs flywheel weight - it's still perfectly driveable even hill starts More cylinders you have the lighter you can go before you start to have driveability issues My new flywheel is 4.5 kgs and I don't anticipate any issues at all |
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Feb 23, 2011 16:36:33 GMT
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In gear (not poping the clutch)acceleration is better with a lighter flywheel. worth doing. Sorry no idea about your flywheel however.
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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flywheel uber skim??sowen
@sowen
Club Retro Rides Member 24
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Feb 23, 2011 19:12:52 GMT
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please yes that would be great. does it cost much to get them refaced? I'll pm you some photos later when I get a chance to hunt in the garage. I had another flywheel re-faced a few years back, it had deeper cracks than this other one which are still visible, but I've been told they're fine buy the guys who did the work. I think it cost me £30 or something like that? Of all the engines and clutches I've pulled apart and worked with, the rover v8 flywheels are the only ones I've personally seen with these cracks in the surface. I'm guessing some flywheels are more prone to it than others? |
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