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!!!!!!
Sounds like a loose or badly leaking cylinder head, It leaks when cold but when the engine warms up everything expands and it seals.
FAHRVERGNUGEN;
Description of a pleasurable sensation,
Experienced when a car and it's driver are in mutual harmony, A unique driving experience, Pleasure, Satisfaction,
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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
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
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.
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
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!!!!!!
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
putting the rods in upside down will cause some engine noise as well. Might want to check that out.
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.
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!!
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.
