Home | Register | Login | Contact Us

 
Auto Math
Classifieds
Forum
Gallery
Games
Garage
Tech Articles
Utilites
 
FAQFAQ    SearchSearch    RegisterRegister    Log inLog in    Log in to check your private messagesLog in to check your private messages    Forum Subscriptions1/4 Mile Table 

would you run these clearances?
Goto page 1, 2  Next
 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Other - Engine Discussion
View previous topic :: View next topic  
Author Message
disturbthepeace1
Member


Joined: 14 Jun 2003
Posts: 303
Location: Stanton, CA
10195.60 points


1965 Volkswagen Beetle

PostPosted: Thu Mar 17, 2011 5:08 pm    Post subject: would you run these clearances? Reply with quote

hey everybody,

give me your .02 on these main bearing clearances for this poncho 400 build. Keep in mind that this motor was line bored and honed and its gonna be a stock head, performer plus cam'ed street cruiser.

stock specs .002-.00017

#1@ 0.0025
#2@ 0.0015
#3@ 0.002
#4@ 0.0025
#5@ 0.0025

this crank does have a 3"(-.010 now) main journal so I don't have a problem with the specs on the loose side. Does #2 seem like a tight clearance to anyone?

thanks for the input

Joe

_________________
http://www.dtpprecisionrebuilding.com
Back to top
View user's profile Send private message Visit poster's website
Paul P
Member


Joined: 15 Aug 2002
Posts: 2449
Location: Townsend, Mass.
83052.36 points


1971 Chevrolet Chevelle

PostPosted: Thu Mar 17, 2011 9:01 pm    Post subject: Reply with quote

I would run .0025"-003" on the mains.
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5578
Location: grassvalley, ca
71842.50 points


1933 Willys Coupe

PostPosted: Thu Mar 17, 2011 9:13 pm    Post subject: Reply with quote

the mains are like 2.80""?

A little tight for me but?
Back to top
View user's profile Send private message
disturbthepeace1
Member


Joined: 14 Jun 2003
Posts: 303
Location: Stanton, CA
10195.60 points


1965 Volkswagen Beetle

PostPosted: Thu Mar 17, 2011 9:40 pm    Post subject: Reply with quote

That's kinda how I feel about #2 but the machine shop is disagreeing with me because it's within spec. I have always had good luck with a thou for every inch of journal and would settle for between .002-.0025 on all. but that one tight journal looks like a hot spot to me.

Any tricks gaining some clearance? I have swapped bearings no change


Thanks

Joe

_________________
http://www.dtpprecisionrebuilding.com
Back to top
View user's profile Send private message Visit poster's website
af2
Member


Joined: 01 Sep 2003
Posts: 5578
Location: grassvalley, ca
71842.50 points


1933 Willys Coupe

PostPosted: Thu Mar 17, 2011 10:26 pm    Post subject: Reply with quote

#2 and 3 need to be addressed!!!!!

You can buy .001" under bearings. I have a few 1/2 shells for small block but none for big block.

The machine shop gona pay the bill when it don't work?

Listen to you're sence. That is all you have to go by.
Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5578
Location: grassvalley, ca
71842.50 points


1933 Willys Coupe

PostPosted: Thu Mar 17, 2011 10:32 pm    Post subject: Reply with quote

Hey you are down ther by Bruce! let mey get his info and let you know!! He is an arrogant puck but good to know!.
Back to top
View user's profile Send private message
10sec.et
Member


Joined: 29 Mar 2006
Posts: 3483
Location: Houston,Texas
347040.52 points


1969 Oldsmobile Cutlass

PostPosted: Thu Mar 17, 2011 10:41 pm    Post subject: Reply with quote

disturbthepeace1 wrote:
That's kinda how I feel about #2 but the machine shop is disagreeing with me because it's within spec.


you need another machine shop. this is a constant fight with Oldsmobiles. sure its in spec but everyone seems to forget that those "specs" were determined half a century ago for a 4000 rpm land barge that just took the kids to school, dad to work and mom to the grocery store. im running my mains at .0035-.004.

_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5578
Location: grassvalley, ca
71842.50 points


1933 Willys Coupe

PostPosted: Thu Mar 17, 2011 10:49 pm    Post subject: Reply with quote

Shyt Poncho. trying to get ahold of Bruce. Give me a bit.
Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5578
Location: grassvalley, ca
71842.50 points


1933 Willys Coupe

PostPosted: Thu Mar 17, 2011 10:54 pm    Post subject: Reply with quote

Here it is. Like Keith said on clearance then argue with Bruce! LOL
http://www.pontiacengines.com/
Back to top
View user's profile Send private message
disturbthepeace1
Member


Joined: 14 Jun 2003
Posts: 303
Location: Stanton, CA
10195.60 points


1965 Volkswagen Beetle

PostPosted: Thu Mar 17, 2011 11:05 pm    Post subject: Reply with quote

10sec.et wrote:
disturbthepeace1 wrote:
That's kinda how I feel about #2 but the machine shop is disagreeing with me because it's within spec.


you need another machine shop. this is a constant fight with Oldsmobiles. sure its in spec but everyone seems to forget that those "specs" were determined half a century ago for a 4000 rpm land barge that just took the kids to school, dad to work and mom to the grocery store. im running my mains at .0035-.004.


Ya i think this will be last motor they see of mine. Get this, he told me "if I torque it down and it spins free that it will be Ok"

The last big block for I had superior automotive in anaheim do a line bore and the clearances were spot on on every journal. They cost a arm and a leg the good machine work is invaluable.

Joe

_________________
http://www.dtpprecisionrebuilding.com
Back to top
View user's profile Send private message Visit poster's website
af2
Member


Joined: 01 Sep 2003
Posts: 5578
Location: grassvalley, ca
71842.50 points


1933 Willys Coupe

PostPosted: Thu Mar 17, 2011 11:31 pm    Post subject: Reply with quote

disturbthepeace1 wrote:
10sec.et wrote:
disturbthepeace1 wrote:
That's kinda how I feel about #2 but the machine shop is disagreeing with me because it's within spec.


you need another machine shop. this is a constant fight with Oldsmobiles. sure its in spec but everyone seems to forget that those "specs" were determined half a century ago for a 4000 rpm land barge that just took the kids to school, dad to work and mom to the grocery store. im running my mains at .0035-.004.


Ya i think this will be last motor they see of mine. Get this, he told me "if I torque it down and it spins free that it will be Ok"

The last big block for I had superior automotive in anaheim do a line bore and the clearances were spot on on every journal. They cost a arm and a leg the good machine work is invaluable.

Joe


Joe, if you are quoting the work don't be shy on adding the $200 more.
The machine work is the start of the job! If done correct you saved many hours to the build.

If you loose a job over $100.00 you probably done yourself a favor.
Back to top
View user's profile Send private message
Knarley Darley
Member


Joined: 22 Apr 2004
Posts: 1247

540238.26 points



PostPosted: Fri Mar 18, 2011 3:49 am    Post subject: Reply with quote

Actually I would torque it and if it spins free then run it. How are you measuring it? Plastiguage isnt that accurate, but it will give a good indication of how they compare to each other. I run all my race engines under .002 on the mains with no problems. Tight mains just means it will have good oil pressure idling in gear hot.
Back to top
View user's profile Send private message
disturbthepeace1
Member


Joined: 14 Jun 2003
Posts: 303
Location: Stanton, CA
10195.60 points


1965 Volkswagen Beetle

PostPosted: Fri Mar 18, 2011 1:36 pm    Post subject: Reply with quote

Knarley Darley wrote:
Actually I would torque it and if it spins free then run it. How are you measuring it? Plastiguage isnt that accurate, but it will give a good indication of how they compare to each other. I run all my race engines under .002 on the mains with no problems. Tight mains just means it will have good oil pressure idling in gear hot.


Plastic gauge? don't touch the stuff. I'm using a dial bore gauge and a mic to get my clearances. What oil weight do you run? And do you run a high volume pump?

Joe

_________________
http://www.dtpprecisionrebuilding.com
Back to top
View user's profile Send private message Visit poster's website
af2
Member


Joined: 01 Sep 2003
Posts: 5578
Location: grassvalley, ca
71842.50 points


1933 Willys Coupe

PostPosted: Fri Mar 18, 2011 8:29 pm    Post subject: Reply with quote

disturbthepeace1 wrote:
Knarley Darley wrote:
Actually I would torque it and if it spins free then run it. How are you measuring it? Plastiguage isnt that accurate, but it will give a good indication of how they compare to each other. I run all my race engines under .002 on the mains with no problems. Tight mains just means it will have good oil pressure idling in gear hot.


Plastic gauge? don't touch the stuff. I'm using a dial bore gauge and a mic to get my clearances. What oil weight do you run? And do you run a high volume pump?

Joe


Joe, double check with plastigage!!! I have missed the #s and found it with the Plastigage! It is a good way to slow down!
Back to top
View user's profile Send private message
10sec.et
Member


Joined: 29 Mar 2006
Posts: 3483
Location: Houston,Texas
347040.52 points


1969 Oldsmobile Cutlass

PostPosted: Fri Mar 18, 2011 8:53 pm    Post subject: Reply with quote

Knarley Darley wrote:
Actually I would torque it and if it spins free then run it. How are you measuring it? Plastiguage isnt that accurate, but it will give a good indication of how they compare to each other. I run all my race engines under .002 on the mains with no problems. Tight mains just means it will have good oil pressure idling in gear hot.


Knarley, this isnt a BBC. the BOP blocks flex a hell of a lot more than the Chevys. any torque with decent traction and it will eat the bearings that tight. of course, if its just going to be built to cruise the highways and never see sticky tires then tight clearances might be ok. my 455 was tight and did fine until it actually hooked up and started putting down some power.

_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Other - Engine Discussion All times are GMT - 5 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
Home | Contact Us | Automath | Cam Files | Dyno Search | Forum | Garage | Picture Gallery | Reaction Timer

Copyright 1997-2018 SMOKEmUP.com All rights reserved.
Advertising Info     Disclaimer     Privacy Policy