92mm P/C-personal experiences

Dizzy · Post by **Dizzy** » Sun Mar 21, 2004 10:59 am

Hi all. For a while now we've been hearing negative things about the 92mm P/C sets. True, the cylinder walls are thinner at the head side of the cylinder but has anyone personally had them warp, break etc? Anyone out there running them and NOT having any problems? I'd like to hear both sides of the story. Thanks.

Guest · Post by **Guest** » Sun Mar 21, 2004 11:10 am

I have a 2074cc in my Manx that has many many miles on a set
of old 92mm NPR (if any of you remember them) cylinders and
pistons and it still runs real strong with little or no blow by. Some
of these miles are very hard offroad miles. Maybe I am just lucky.

mharney · Post by **mharney** » Sun Mar 21, 2004 11:19 am

I had some. They blew up.

Dizzy · Post by **Dizzy** » Sun Mar 21, 2004 11:35 am

mharney wrote:I had some. They blew up.

could you be a little more specific please. what motor combo. how many miles were on it.
It's kinda like saying the world trade center blew up.....but how??
Not being rude, it's just that I'm having a motor built and I'm trying to decide if i want 92mm pistons.....only cuz i'm getting a deal on them.

mharney · Post by **mharney** » Sun Mar 21, 2004 11:46 am

I put them in there and it blew up.

Specifically it made sort of a POW sound.

It never made it off the stand.

Dizzy · Post by **Dizzy** » Sun Mar 21, 2004 11:54 am

i stand corrected....i guess they did blow up.
was it pow, POW, or more of a crash, screech, bang with a little whistle at the end? j/k
ok, so one negative for 92's and one positive so far...anyone else?

mharney · Post by **mharney** » Sun Mar 21, 2004 12:02 pm

Well, it sorta made this long sick "mmmmuuuuuuuuuuuuuummmmphhhhhhhhhhhh" *POW*! sound, and then it blew up.

I don't recall any bangs or screeches, but I peed a little. I was scared.

69bug4me · Post by **69bug4me** » Sun Mar 21, 2004 1:47 pm

Where you been hiding at mharney?

Haven't seen you on here much since the lounge was shut down,did you get exiled also.

Shane

stealth67vw · Post by **stealth67vw** » Sun Mar 21, 2004 2:40 pm

The first VW I ever drove was my dad's 68 bus. He bought it in 1986 for $250 with no motor. He had built an 1835 with a Holley Bugspray, Norris cam and stock 040 heads. It was daily driven to his work, about 20 miles a day. It had great power for about 6 months and the power started to slowly decline. My dad was a GM mechanic by trade for 25 years at this point so he decided to do a leak down test on it. It showed between 10 and 15% leakdown. He didn't have the time or money to tear it down so he kept driving it. He would have to add a quart of oil every 1000 miles or so and it didn't leak(externally).

In the mean time I had started building another motor (my first). I was just getting into VWs and learned that 92s were not so good. So I built a bullet proof 1600 with money I earned scrubbing toilets at my mom's book store. I used a full flowed case, DMS c/w crank, GME rods, forged 85.5s, stock heads with a little porting, a CB Eagle 2241 cam and a Weber progressive (yuk) and a Pertronix Ignitor. When I had finished the replacement motor the blow by was so bad on the 1835 that when you pulled off the oil cap it would blow blue smoke rings out of the filler everytime it fired.

I put the 1600 in my dad's bus the summer of 1988. Right off the bat it made a ton of more power, ran alot cooler, didn't use any oil and it could be driven anywhere. I didn't go easy on it either. 2 minute long burnouts, donuts(very strange feeling) and doing 95 mph is not easy on any motor in a low geared bus.

This motor eventually ended up in my dad's 1970 Ghia w/ a stock carb, my 1970 Ghia w/ Baby Dells and finally in my 1967 bug w/36 Dells. It logged well over 150,000 miles very hard mile and finally met it's demise in 1995 when the nut holding down the oil pickup tube came loose, allowing the pickup to come in contact with the cam, which in turn rubbed a hole, allowing the oil pump to suck air burning a rod bearing. I bet it would still be running today if that nut didn't come loose.

I have not had a good experience with 92 p&cs so I will not use them again. I hope this adds some insight on your views.

warrenbaity · Post by **warrenbaity** » Sun Mar 21, 2004 3:43 pm

i was down in mexico about a month ago for the san felipe 250. my work runs a 16 class car and during the prerun for the race, they used someones manx with an 1835 in it. now i know that they werent doing the actual race and that they werent pushing the car as much as they would be during the actual race, but they preran almost the entire course with the car. it already had about 30k miles on it too. so count one more + on the 92's. oh yeah, and i had a bug a while back with an 1835 in it and it ran pretty well. i only put a couple thousand miles on it but it didnt blow up or anything like that. so i guess thats +2 for the 92's

mharney · Post by **mharney** » Sun Mar 21, 2004 3:51 pm

Been in Washington DC. Just got back yesterday. I'll be in and out this week.

stealth67vw · Post by **stealth67vw** » Sun Mar 21, 2004 3:52 pm

I work with a guy that went to San Felipe last month to help his brother with his class 1600 car. His name is Kevin Baity. He is from Hemet, Ca. Is there any relation?

James2 · Post by **James2** » Sun Mar 21, 2004 3:53 pm

They suck!

Why? Because they are not 94's and 94's and 92's cost the same!

So why run some lame ass 92, when you can have 94 for the same price??????????????

Now, who has had a bad experience with 94's? No ONE, that's who, If they did, they are a freaking idiot, "cause they put them in wrong or somehow screwed the whole deal up.

So this ends the debate. There should only be two cylinder sizes, 85.5 and 94mm. Anything else sucks!!!!

warrenbaity · Post by **warrenbaity** » Sun Mar 21, 2004 4:05 pm

hey james, what about 90.5's? where would we be without our beloved 1776's?!

MASSIVE TYPE IV · Post by **MASSIVE TYPE IV** » Sun Mar 21, 2004 4:56 pm

worst cylinder on the planet!

I have seen them split right down the middle with 9:1 CR!