TeamSwift

Home of the Suzuki mini-compacts ! Your Home for all things Suzuki Swift, Geo Metro, Holden Barina, Chevy Sprint, Pontiac Firefly, and Suzuki Cultus. TeamSwift is a technical performance oriented community!
It is currently Thu Nov 23, 2017 6:38 am

Underbody braces, turbos and more!

All times are UTC - 5 hours




Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: head shave or block ?
PostPosted: Fri Jun 11, 2010 9:07 pm 
Offline

Joined: Fri Jul 04, 2008 6:57 am
Posts: 10
Location: Green Bay WI
I was thinking of rebuilding my engine and instead of shaving the head I have thought about decking or shaving the block. Thusly getting a better quench to the head/chamber. Does anyone know what the clearance is between the head and pistons top factory? And what side do you guys think would be best for economy to shave from?


Top
 Profile  
 
PostPosted: Mon Oct 18, 2010 7:58 am 
Offline

Joined: Sun Sep 12, 2010 1:59 pm
Posts: 3
Location: 98043
Shoot for about .035" quench distance.

If you're overhauling the engine, then it's a no-brainer: measure where the pistons are at TDC in relation to the block deck before you final-assemble (yeah, this means you've got to mock up at least one cyl and the crank). The manufacturer should be able to give you the compressed thickness of the gasket.

Then you'll know how much to cut and from where. Any other method is just keyboard jockey stuff. Guys who build the engines tend to cut the decks and size the bores AFTER all the parts are in hand... 'cause those bits all can fall on one side or other of a nominal spec.

Is it a hassle? Hell yeah. It's a big part of why one 350 chev will sell for $1500, complete w/ parts, and another will have a $2000 shop bill for just machine work. If you want it really done right, it's a bit of work. Sorry I don't have the magic bullet for ya'.

-Bill


Top
 Profile  
 
PostPosted: Mon Oct 18, 2010 8:00 am 
Offline

Joined: Sun Sep 12, 2010 1:59 pm
Posts: 3
Location: 98043
Oh, and I forgot, I'd recommend throwing a degree wheel on and degreeing that cam, too. Esp. when whacking material off the heads and/or block deck.

-Bill


Top
 Profile  
 
PostPosted: Mon Oct 18, 2010 2:54 pm 
Offline
Moderator
Moderator
User avatar

Joined: Sun Feb 23, 2003 4:16 am
Posts: 8042
Location: Ontario, Canada
The pistons are zero deck height.

You don't say what motor you have, so I can't make a recommendation.

_________________
Contact 3tech: g10pro@rocketmail.com


Top
 Profile  
 
PostPosted: Thu May 12, 2011 9:55 am 
Offline

Joined: Fri Jul 04, 2008 6:57 am
Posts: 10
Location: Green Bay WI
1.0


Top
 Profile  
 
PostPosted: Mon May 23, 2011 9:10 pm 
Offline

Joined: Fri Jul 04, 2008 6:57 am
Posts: 10
Location: Green Bay WI
I took .030 off the deck and unshrouded around the valves, when I went to order my valves out of california today they said some guy our od Canada made a big order of SS valves huh wonder who that was :huh:


Top
 Profile  
 
PostPosted: Mon May 23, 2011 10:48 pm 
Offline

Joined: Thu Jul 20, 2006 7:17 pm
Posts: 1408
Location: Alberta, Canada
So, does the piston stick up out of the block 0.030" now? Is it not going to smash into the head?

_________________
1995 Swift w/16V 4.39s, 3tech cam, Esteem t-body, Header, needs more.
1995 Gt Mustang "Boss Shinoda" package.
1999 F150 4x4 Supercharged
1967 Mustang 428 auto, never ending expensive project
1993 Civic si h22a, fell in my lap, couldn't resist!


Top
 Profile  
 
PostPosted: Tue May 24, 2011 7:33 am 
Offline

Joined: Fri Jul 04, 2008 6:57 am
Posts: 10
Location: Green Bay WI
No cause the head gasket is around .055 when compressed I would say it will crush to .045 giving around .015 between head and piston. This creates a little wedge effect and makes it less prone to detination.


Top
 Profile  
 
PostPosted: Sat Jun 04, 2011 11:44 am 
Offline

Joined: Fri Jul 04, 2008 6:57 am
Posts: 10
Location: Green Bay WI
Have the XFI trans going on today and new clutch should be al together this weekend just waiting on my regrind cam to com back from DELTA cams some time this week I would think. WOOT can't wait. yes the piston was .030 out the hole and the old head gasket measured out to .055 so I should have .015 left should be awesome wedge effect and CR. :D


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: aaardvarkrv and 2 guests


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 post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group