 Engine Assy Questions - P&C's Alignment |
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| vesnyder |
 Oct 24 2007, 08:21 AM
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#1
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Senior Member  Group: Members Posts: 680 Joined: 14-April 05 From: Cleveland, OH Member No.: 3,933  |
I am in the process of assembling new P&C's onto my motor and Jake's video says the cylinders arrow should point to the flywheel - except on mine there is not an arrow? I have AA P&C's - is there a parrticular alignment I should use? The only marking on the cylinder I see is "STD" stamped on top. Somebody also maked the bottom of the piston with a red marker on the side that is aligned to the non-flat side of the cylinder. Anything I should do or just "bolt them up"?
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Replies(1 - 8)
| type47 |
Oct 24 2007, 08:58 AM
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#2
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
i thought that the "pointing" of the pistons was very important, i think it has something to do with piston slap or the pressure of the piston skirt on the cylinder. i faintly recall that the 2.0L piston pin is offset so as to produce even skirt to cylinder pressure so that one side of the piston doesn't wear more than the other side of the piston. i don't know what the measurements are but if your piston isn't marked as to which side goes toward the flywheel you could measure the distance from the center of the piston wrist pin hole to the 2 opposite sides of the piston. but i don't know what to do with those measurements.
Cap'n ???? |
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| toon1 |
Oct 24 2007, 09:10 AM
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#3
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
there should be an arrow notop of the "piston" that will point towards the flywheel.
If I recall there is no arrow on the cyl's. |
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| blitZ |
Oct 24 2007, 09:13 AM
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#4
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Beer please... Group: Members Posts: 2,223 Joined: 31-August 05 From: Lawrenceville, GA Member No.: 4,719 Region Association: South East States |
Not all pistons have an orientation. You might want to contact the manufacturer.
The KBs I got from Jake go either way. (IMG:style_emoticons/default/unsure.gif) |
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| geniusanthony |
Oct 24 2007, 09:32 AM
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#5
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Its a brand new "Chrome-sicle" Group: Members Posts: 517 Joined: 12-December 05 From: Alexandria,VA Member No.: 5,266 Region Association: MidAtlantic Region |
In reading the Tom Wilson book about Rebuilding your Aircooled VW engine, I seem to remember that only Type 1's had the orientation marks. Damn now I am thinking back trying to remember if I did this or not when I built mine...
Someone please put my mind at ease on this one...ANd yeah, vesnyders too (IMG:style_emoticons/default/biggrin.gif) |
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| StratPlayer |
Oct 24 2007, 10:06 AM
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#6
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StratPlayer Group: Members Posts: 3,278 Joined: 27-December 02 From: SLC, Utah Member No.: 27 Region Association: Rocky Mountains 
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When installing my new pistons and cylinders I had the euro pistons. They had and emblem on the pistons that looked like a crankshaft and that emblem was installed with the emblem facing the flywheel on all cylinders
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| Cap'n Krusty |
Oct 24 2007, 10:56 AM
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#7
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(geniusanthony @ Oct 24 2007, 08:32 AM)  In reading the Tom Wilson book about Rebuilding your Aircooled VW engine, I seem to remember that only Type 1's had the orientation marks. Damn now I am thinking back trying to remember if I did this or not when I built mine... Someone please put my mind at ease on this one...ANd yeah, vesnyders too (IMG:style_emoticons/default/biggrin.gif) That's the rods (and the pistons). T4s have symmetrical rods, so it doesn't matter, but I've never seen a T4 piston that didn't have a mark, and the marks are meant to be used. FWIW, I've not seen every T4 piston ever made, LOL. The Cap'n |
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| Borderline |
Oct 24 2007, 11:09 AM
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#8
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Senior Member Group: Members Posts: 720 Joined: 8-February 05 From: San Juan Bautista, CA Member No.: 3,577 Region Association: Northern California |
I asked the same question last year when assembling my 1911. The AA pistons are symmetric and can be assembled either way.
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| vesnyder |
Oct 24 2007, 02:23 PM
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#9
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Senior Member Group: Members Posts: 680 Joined: 14-April 05 From: Cleveland, OH Member No.: 3,933 |
Thanks! Borderline - very interested in the oucome of your 1911. Did it meet expectations?
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