| [ Total Views: 993 | Total Replies: 10 | Thread Id: 822 ] |
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 mattie182
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| posted on September 24th, 2002 at 09:12 PM |
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Motor Slap
I know this guy whohas a rebuilt 1600cc VW engine. Replaced everything, with new, but now when it runs, there is a motor 'slap'. This noise
stops when the engine heats up, then starts, when you accelerate
Ant suggestuions
Matt
Once you go flat, you never go back!!!!!!
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Menangler
A.k.a.: Dave Becker
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| posted on September 24th, 2002 at 09:19 PM |
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Sounds like a loose or badly leaking cylinder head, It leaks when cold but when the engine warms up everything expands and it seals.
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Che Castro
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| posted on September 24th, 2002 at 09:48 PM |
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when i had a pulled head stud and was leaking from the cylinder head/cylinder joint it got worse as soon as it heated up because the sealing area
would get hot enough to ignite the air/fuel mixture and would create the evil popping sound |
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Grey 57
A.k.a.: Dean
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| posted on September 25th, 2002 at 09:20 AM |
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Same thing can happen with slightly loose exhaust manifolds. Small gap closes when the heads heat up. Just put a new exhaust on the 57 and this very
thing happened. Make sure you use lock washers on the exhaust studs to prevent it happening again. :thumb
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Zenjoe
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| posted on October 10th, 2002 at 03:51 AM |
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check your cranck shaft end play. If you can pull on your pully and feel it move, you end play needs to be redone, FAST!
the end play should be at .003 to .005 (inch) more than that will kill your engine in short order.
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vwrallycar
A.k.a.: Andrew Rankin
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| posted on October 10th, 2002 at 09:44 PM |
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i personally know of this engine and the person building it and from what i know about it it seems to be a major mystery. havent heard the latest on
it but will try to find out. everything has been checked several times, so it will be interesting to finally see what the cause is
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mattie182
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| posted on October 11th, 2002 at 09:17 AM |
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Hmmmm, I guess you know its Rex and his rat...........
i told him that id post a message here to see what else people can come up with
The motor has been rebuilt twice!!!!!! and the slap is still there
matt
[Edited on 10-10-2002 by mattie182]
Once you go flat, you never go back!!!!!!
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vwrallycar
A.k.a.: Andrew Rankin
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| posted on October 12th, 2002 at 05:06 PM |
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hi mattie yeah i dont know what the problem is. maybe he needs to look at another motor, i know he has one there to rebuild
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Zenjoe
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| posted on December 3rd, 2002 at 02:03 AM |
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putting the rods in upside down will cause some engine noise as well. Might want to check that out.
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 vw54
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| posted on December 3rd, 2002 at 06:28 AM |
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You say they replaced everything
Does that include pistons and Barrels
Also the pistons could be in wrong way and also the conrods upside down.
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Secoh
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| posted on December 3rd, 2002 at 10:24 AM |
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Has he replaced the small end bushes? these, when worn or reamed to an incorrect size can make a knocking slapping kind of a sound.
sounds like a big end, but not as deep a sound and not a solid sounding knock like a big end makes.
Sure it's not something as simple as pinging? (just checking  )
If it aint broke,
Make it go faster!!  |
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vw54
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| posted on December 3rd, 2002 at 05:52 PM |
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Adz
12, 15 and 1600 VW Conrods have an up and down built into them.
the up part is the notch on the center on the I section of the rod.
This means they are OFF SET same as pistons.
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