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Author Topic: 2276 questions  (Read 49372 times)
Peter
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« on: March 18, 2007, 13:21:29 pm »

hi guys,
i'm mocking up some parts to check the clearances

i cannot find the needed journal to bearing clear. for cb h beam rods
side clearance i'm aiming for is 0.018 inch
mains: 0.003
cam: 0.001

are these values correct?
does anybody know the stretch values of arp 2000 bolts? my rods came only with the torque specs: 15 lbs, 20 lbs, 25, final 29

thanks, Peter
« Last Edit: May 17, 2007, 09:41:01 am by ruff » Logged
Peter
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« Reply #1 on: March 18, 2007, 15:26:05 pm »

hi guys,
after a minute of searching by my girlfriend, she found my Tom Wilson book back again;
i' ve been searching this for a week Smiley

i found the clearance for stock engines: 0.0025; is this ok for high output engines?
 i'm gonna plastgage them now Smiley

see ya!
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Peter
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Posts: 1299



« Reply #2 on: March 18, 2007, 19:53:12 pm »

hi guys,
some bad news i think..
i torqued the case to about 35Nm with the crank inside to check for drag or something..
then i turned the crank and felt a spot with some more resistance..
so i loosend the case a bit and crank is spinning fine...
i take the crank out of the case to check the bearings and what do i see?
the middle split bearing looks polished a bit on certain areas..the rest remained the same
i ll post a pic this evening
my case is shuffle pinned at that bearing, maybe something to think about? its an autolinea one
i m gonna try to check the crank for runout at work..what values should i get?

thanks, Peter
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Peter
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« Reply #3 on: March 18, 2007, 20:12:16 pm »

heres a pic..
the marks are at 1 an 7 o clock, so opposed to each other

what do you think?

greets, Peter
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Roman
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« Reply #4 on: March 18, 2007, 21:03:53 pm »

Did you use the O-rings? That is a NO-NO when you have shuffle pins, it can actually warp the case.
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Peter
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« Reply #5 on: March 18, 2007, 21:21:12 pm »

no,
i didnt use them..
case seems to be straight also;
i checked afterwards with a ruler

thanks, Peter
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LGK
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WWW
« Reply #6 on: March 19, 2007, 02:06:57 am »

no,
i didnt use them..
case seems to be straight also;
i checked afterwards with a ruler

thanks, Peter

Hi Peter,

Check/measure your crank on the journals,then bore-gauge the linebore of the case,you want something like 0.07mm clearence.
Be sure the bearings are okay too...

Btw; your cam is ready for pick up ,if you come by at the shop bring your stuff with you we'll check out .

See ya,

Steve
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Peter
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« Reply #7 on: March 21, 2007, 13:21:20 pm »

I ll do that Steve, thanks

cheers, Peter
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stealth67vw
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Posts: 2261



« Reply #8 on: March 22, 2007, 03:04:53 am »

Typical side clearance for a performance engine should be .010"(.25mm) or more. Most well known engine builders shoot for .016-.018"(.40-.45mm). I have read from .002-.003 is perfect journal clearance. Any less and you run the risk of spinning a rod bearings.
« Last Edit: March 22, 2007, 03:07:26 am by stealth67vw » Logged

John Bates
JB Machining Services
1967 street bug 2020lbs w/driver
12.34 @ 108 mph 1/4
7.76 @ 89mph 1/8
Peter
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Posts: 1299



« Reply #9 on: March 22, 2007, 12:43:10 pm »

hi guys,
i boregauged the bearings when installed and torqued to 25 lbs
nr. 1 main is ok
nr.2 main: i measured at the marks and had zero clearance: 54.73 ; then i turned the boregauge 90 degrees and clearance was too much: 54.85 or something,
nr 3 main where i saw the small marks was also a bit tight maybe, i think it was 54.80 or 79

cheers, Peter
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Peter
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Posts: 1299



« Reply #10 on: March 23, 2007, 12:11:15 pm »

Hi guys,
i checked how much the dowel pegs extend out of the saddles and it was 0.25 mm less then in an as21 case i have lying around;
so i dont think the dowels are the cause..
I brought my parts to Steve, so I ll know soon what is wrong.
See ya at Volksworld!!!
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Peter
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Posts: 1299



« Reply #11 on: April 23, 2007, 22:47:46 pm »

Hi guys,
so my crank issue is solved, but now my cam is binding when i torque the case Cry
I can see some spots where the cam seems to have touched the bearings
i measured the cam journals with a caliper, they were about 25.01 mm; i had about 0.015 mm oilclearance with plastigauge,
how much endplay should i be aiming at, because i ll have to sand the thrustbearing a bit down:
i dropped an old cam in the case and this spinned allready much better, this cam gave a lot more end play, i can hear this one  rocking, but with the new cam,
there s almost no movement possible.
I m gonna check it for runout tomorrow, and if its straight,i think i ll polish the cam journals bit by bit
What do you think?

Cheers, Peter

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Peter
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« Reply #12 on: April 24, 2007, 11:57:26 am »

Aggrivation for sure!!
my problem was a combination of things:
main journal od oversized; probably some pinching from the shuffle pins
joy joy joy!

cya!!
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Peter
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« Reply #13 on: April 28, 2007, 20:17:37 pm »

hey guys;
so today i took some material from the cam: journals are about 24.99 mm now, so within vw tolerance
because the cam was still binding ; i started to sand the bearings at the spots where i could see the drag marks;
then i put the cam back in the case and closed the case; then turned the cam and checked again for drag..
i did this sequence more then ten times; but the cam wont free up.....
after lots of swearing; i tried something else: cam in case; case closed; the i take the cam ends with my index fingers and try to wiggle it up and down ( the case is lying with the cilinder bores facing down); and its loose as hell( in the radial sense) ; soo loose that it feels like i can move it up and down for 1 mm or something..
i dont know what to do anymore.... how is it possible that it turns so hard while i can move it up and down so much?
I m in the dark Cry Cry

cheers, Peter
« Last Edit: May 17, 2007, 09:40:06 am by ruff » Logged
Roman
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« Reply #14 on: April 29, 2007, 21:42:13 pm »

It sure sounds like a warped case as have problems with both the main bearing tunnel and the cam bearing tunnel. I had a brand new Mexican case that was just like yours a couple of years ago but I switched it. Life and european summers are too short to spend weeks on a bad case.
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Peter
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« Reply #15 on: April 30, 2007, 11:47:17 am »

hey guys,
the case is a new alu one, not filled or welded behind nr3..
an engine builder advised me to sand the cam down to 24.98 even 24.97
if it still binds ; i ll kick the f"cker out of my way
i have the green plastigauge, but dont need it yet because the cam even binds if i just put the other half on by hand
i know with todays parts everything needs additional work; but is this normal?
i dont want to put extra money in it if it wasnt needed with another case.. am i making sense or am i wrong?

cheers, Peter
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Peter
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« Reply #16 on: May 01, 2007, 18:07:01 pm »

hello;
today i made some progress;
i ll try to explain Smiley
at first, i put new bearings in the case (the two ones without thrust face)
then i layed the cam in ( i left the thrust bearing out)
installed a dial indicator on the journal without the bearing to check runout
well, i measured about 80Ám runout
then i installed the thrust brearing and took the middle one out;
measured runout at the middle journal and it was about 40 - 50Ám
in the end i measured runout of the journals themselves ; this was for all three about 5 Ám
i think i have found a problem Smiley

cheers, Peter
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Peter
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« Reply #17 on: May 01, 2007, 22:01:41 pm »

well on jim martins page i found max cam runout is 0.02 mm,
i measured 0.08 mm:)
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Peter
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« Reply #18 on: May 01, 2007, 22:02:51 pm »

so i think the cam is not straight Huh
but i could be wrong ofcourse Smiley
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Roman
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« Reply #19 on: May 02, 2007, 11:26:51 am »

It is easy to measure, just put it in one case half and use a dial indicator to measure the runout.
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Peter
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« Reply #20 on: May 02, 2007, 17:40:38 pm »

well  this is what i did  Grin
measured 0.08 runout

cheers, Peter
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Peter
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« Reply #21 on: May 02, 2007, 21:39:32 pm »

hey guys ,
i got a pic of how i measured things..
and another one  Cheesy
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Peter
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« Reply #22 on: May 02, 2007, 21:40:39 pm »

 Smiley
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Peter
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Posts: 1299



« Reply #23 on: May 17, 2007, 09:51:52 am »

hey guys!!
some additional questions:
so engine will be: 2276, web 86 c, 44 * 37 wedgeports ;..
-> now i m thinking what kind of header do i need? 1 5/8 ; 1 3/4 ? i dunno what horsepower it will make but i m sure my face will look like this after  my testdrive: Grin
->and then which brand? i want a header that doesnt need cutting the valance and looks like the one Neal Anderson is using on his black 56.
do you guys know which oner i m babbling about? would be a great help Grin

cheers, Peter
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Peter
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Posts: 1299



« Reply #24 on: May 18, 2007, 00:12:10 am »

hey hey Jim!
my case and cam are back to the shop;
it should be okay if i get everything back...
the only thing that could also be wrong is the rod to journal clearance..
i didnt check this one out yet, but i hope i have some luck here Smiley
I also weighed the pistons and one is 6 g heavier than the other three...
is it safe to remove 6 g ( i heard 6 g is a lot) like in this pic?

cheers, Peter
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Peter
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« Reply #25 on: May 22, 2007, 11:24:19 am »

hello  Tongue
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Rune
SCC Crew
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Screwdrivers #7


« Reply #26 on: May 22, 2007, 21:09:41 pm »

I think Berg has the Phoenix headers back in stock..
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Peter
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Posts: 1299



« Reply #27 on: May 23, 2007, 16:43:00 pm »

Hi Dudes,
and what about the pistons? safe to remove 6 grams?

Cheers, Peter
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Zach Gomulka
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Don't piss down my back and tell me it's raining.


« Reply #28 on: May 23, 2007, 16:54:22 pm »

Its safe. Just dont do it all in one spot Wink
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Born in the '80s, stuck in the '70s.
Peter
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« Reply #29 on: May 23, 2007, 18:46:08 pm »

Thanks man!

cheers, Peter
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