Home 
Home Search search Menu menu Not logged in - Login | Register
> Jensen Healey & Jensen GT Tech > Engine & Transmission > .060" over pistons

 Moderated by: Greg Fletcher
New Topic Reply Printer Friendly
.060" over pistons  Rating:  Rating
AuthorPost
 Posted: 01-31-2012 12:32 am
  PM Quote Reply
1st Post
Ricardo_Julio
Member
 

Joined: 09-09-2009
Location:  
Posts: 17
Status: 
Offline
 I'm in the process of rebuilding my '74 907 engine and I do not have the funds for an all out stroker, so I'll like to know where can I get .060 over pistons and rings, of course; Have anybody done this before?  any and all help will be greatly appreciated.
   Than you all in advance
Back To Top PM Quote Reply  

 Posted: 01-31-2012 02:19 am
  PM Quote Reply
2nd Post
Jensen Healey
Super Moderator


Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
Status: 
Offline
 The 907 is already substantially over square and has real issues with torque at under 3500 rpm. Boring the cylinders .060 over will only make it worse.

Just throw a supercharger on it.
Back To Top PM Quote Reply

 Posted: 01-31-2012 11:47 pm
  PM Quote Reply
3rd Post
Ricardo_Julio
Member
 

Joined: 09-09-2009
Location:  
Posts: 17
Status: 
Offline
 thanks for keeping me from making a very bad mistake; I knew that the volumes of knowledge here was going to help me.
Back To Top PM Quote Reply  

 Posted: 02-01-2012 02:23 am
  PM Quote Reply
4th Post
Jensen Healey
Super Moderator


Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
Status: 
Offline
 It wouldn't be so bad, but not worth the money.
Back To Top PM Quote Reply

 Posted: 02-01-2012 02:05 pm
  PM Quote Reply
5th Post
pbahr
Member


Joined: 04-15-2005
Location: Phoenixville, Pennsylvania USA
Posts: 202
Status: 
Offline
 Seems it would be better, and easier, to put a 2.2 crank in it....

YELODOG
Back To Top PM Quote Reply  

 Posted: 02-08-2012 08:39 pm
  PM Quote Reply
6th Post
subwoofer
Member
 

Joined: 04-01-2008
Location: Sandefjord, Norway
Posts: 617
Status: 
Offline
 New liners are £56 a piece from SJ Sportscars, they also have 11:1 pistons for the 2.0, a set of 4 is £510 pounds. Not for free, I know, but still cheaper than a stroker kit.
Back To Top PM Quote Reply

 Posted: 02-16-2012 02:23 am
  PM Quote Reply
7th Post
Ricardo_Julio
Member
 

Joined: 09-09-2009
Location:  
Posts: 17
Status: 
Offline
 Thankyou guys for your info, I'm glad I'm in this forum.
Back To Top PM Quote Reply  

 Posted: 01-31-2013 11:41 pm
  PM Quote Reply
8th Post
roverman
Member
 

Joined: 11-07-2008
Location:  
Posts: 85
Status: 
Offline
 Jensen Healey wrote: The 907 is already substantially over square and has real issues with torque at under 3500 rpm. Boring the cylinders .060 over will only make it worse.

Just throw a supercharger on it.
Ok, I'll bite...how does boring .060" over standard, reduce torque ? Cylinder head air flow should increase. Thermal losses should be reduced. As I understand it, psi created, when mixture lights-off, now more square inches = more total pressure= more torque/power.  Cheers, roverman.
Back To Top PM Quote Reply

 Posted: 02-01-2013 01:17 am
  PM Quote Reply
9th Post
Jensen Healey
Super Moderator


Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
Status: 
Offline
 It would move the torque peak to a higher rpm.

In a race car that's not an issue.

If one is searching for more enjoyment out of the 907, boring out the cylinders doesn't seem like the place to start.

Of course, if the pistons are being replaced anyway....
Back To Top PM Quote Reply  

Current time is 07:13 pm  
> Jensen Healey & Jensen GT Tech > Engine & Transmission > .060" over pistons Top


UltraBB 1.172 Copyright © 2007-2011 Data 1 Systems