Fieldy
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| posted on 9/9/11 at 09:15 AM |
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Strange noise - Locost 7
Right then, I posted last week about a broken wishbone and that is all sorted, so thanks to everyone for the advice. I also mentioned that I had to
change the left hand halfshalf (mrk1 Escort) I did this without to much hassle, bolted everything back on and went for a spin.
The car drives fine up to about 45/50 mph then a it starts to make (this is going to be tricky to explain) a woomp woomp woomp sound that shakes the
car, it also effects the engine note
My thoughts are that is could be
Bend/ unbalanced wheel (I did hit a kerb quite hard) although no visible bend or flat spot in the wheel (will get that checked tomorrow)
Damage to the diff
I'm still new to this so does anyone else have any other ideas what it could be? I appreciate my description is pretty naff!
For reference the Car is a Locost 7 with an R1 engine, mrk 1 escort bits
Thanks in advance for your help
Matt
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adithorp
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| posted on 9/9/11 at 09:34 AM |
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It could have bent/buckled the wheel. I doubt you could damage the half-shaft without doing that as well. Jack it up and turn the wheel to see any
wobble. I'd expect it to be felt as shaking through the seat though. Could have damaged the wheel bearing or even bent the axle tube itself.
I'd assume you used a new bearing when replacing the half-shaft so could rue that out(unless the new bearing is faulty- not unheard of).
Is there anybody local who could have a ride and give a second oppinion? UK isn'tmuch of a clue to location.
[Edited on 9/9/11 by adithorp]
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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dlatch
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| posted on 9/9/11 at 09:47 AM |
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too bend a half shaft i would indeed be expecting wheel damage also and a buckled wheel can be tricky to spot sometimes.
are you sure you have not damage the rear suspension so something could be rubbing as well?
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Fieldy
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| posted on 9/9/11 at 09:48 AM |
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Cheers for the quick response,
I did spin the wheel and it looked ok, but looks can be deceiving I guess. Ill get that checked tomorrow... But yes I guess you could feel it though
the seat as well the noticeable thing was the noise but I guess if if the wheel is wobbling loads it going to affect the engine (engine runs fine)
To confirm yes the new halfshaft came with a new bearing already on it (the old one was smashed) so I guess its unlikely to be that. I really hope I
haven't bent the axle that would be a ball ache!
I did mean to get round to that, I live in Solihull
I think it will be the wheel but wanted to double check peoples thoughts
Cheers
Matt
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theduck
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| posted on 9/9/11 at 09:56 AM |
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Worth giving Btm performance a call, Fred who runs the place is a star and I'm sure would be happy to have a look over it for you.
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myke pocock
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| posted on 9/9/11 at 10:11 AM |
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Another thought is did you damage the casing of the tyre in any way. That may manifest itself at higher speed.
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Neville Jones
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| posted on 9/9/11 at 10:16 AM |
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To suggest something out of the norm, but something very similar that I've experienced, exhaust harmonic.
I had a crossflow engine in a car years ago, that made a weird woomp woomp at about 3200revs, and was tracked to the exhaust. The whole system, engine
and car would vibrate. Changed the muffler and it was gone. Also check the exhaust mounts. You never know...
Cheers,
Nev.
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Fieldy
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| posted on 9/9/11 at 10:21 AM |
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quote:
Originally posted by Neville Jones
To suggest something out of the norm, but something very similar that I've experienced, exhaust harmonic.
I had a crossflow engine in a car years ago, that made a weird woomp woomp at about 3200revs, and was tracked to the exhaust. The whole system, engine
and car would vibrate. Changed the muffler and it was gone. Also check the exhaust mounts. You never know...
Cheers,
Nev.
That maybe a good shout, it was that side that decided to climb a curb! Ill check that tonight!
Cheers
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Fieldy
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| posted on 9/9/11 at 10:22 AM |
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quote:
Originally posted by myke pocock
Another thought is did you damage the casing of the tyre in any way. That may manifest itself at higher speed.
Slight piece missing, but i doubt enough to make a difference, cheers for the idea
Matt
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adithorp
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| posted on 9/9/11 at 10:38 AM |
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I'd chek the rear wheel alignment.It should be zero degrees near as damit. If it's out, roll the car half a turn of the wheels and check
again. If the reading changes (ie 1degree toe-in becomes 1 degree toe-out) then it's the wheel/flange thats bent. If it stays the same
it's the axle. If it goes from 1/2'in to 1 1/2'out then its both!
When you say new 1/2shaft/bearing do you mean new or replacement (second hand)?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Fieldy
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| posted on 9/9/11 at 12:16 PM |
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quote:
Originally posted by adithorp
I'd chek the rear wheel alignment.It should be zero degrees near as damit. If it's out, roll the car half a turn of the wheels and check
again. If the reading changes (ie 1degree toe-in becomes 1 degree toe-out) then it's the wheel/flange thats bent. If it stays the same
it's the axle. If it goes from 1/2'in to 1 1/2'out then its both!
When you say new 1/2shaft/bearing do you mean new or replacement (second hand)?
Sorry probably didnt make that clear, the shaft wasnt bent but the flange was, the halfshaft comes all in 1 piece - shaft, flange ect. The halfshaft
is second hand but is (by eye) straight, the bearing is new
Matt
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40inches
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| posted on 9/9/11 at 02:46 PM |
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quote:
Originally posted by Fieldy
quote:
Originally posted by myke pocock
Another thought is did you damage the casing of the tyre in any way. That may manifest itself at higher speed.
Slight piece missing, but i doubt enough to make a difference, cheers for the idea
Matt
A piece of tyre is missing
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Fieldy
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| posted on 9/9/11 at 02:54 PM |
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quote:
Originally posted by 40inches
quote:
Originally posted by Fieldy
quote:
Originally posted by myke pocock
Another thought is did you damage the casing of the tyre in any way. That may manifest itself at higher speed.
Slight piece missing, but i doubt enough to make a difference, cheers for the idea
Matt
A piece of tyre is missing
Haha, "piece" isnt the best way to describe it, more of a 5p sized slither nothing major..
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