 Engine question, Can I bore out 1.8 cylinders to 96mm? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| MattR |
 Nov 15 2005, 06:45 PM
Post
#1
|
|
Advanced Member  Group: Members Posts: 3,279 Joined: 23-January 04 From: SF Bay Area Member No.: 1,589 Region Association: Northern California  |
It looks like my 2.0 cylinders were bored too big. My ring gap is .028", which isnt right for my 96mm KB pistons. I do have another set of 1.8 cylinders laying around. Are they dimensionally the same as a set of 2.0 cylinders? Can I just bore out the 1.8 cylinders to the proper size for my 96 pistons?
|
   |
 
|
  |
Replies(1 - 16)
| SLITS |
Nov 15 2005, 06:50 PM
Post
#2
|
|
"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
93mm vs 94mm
Maybe you should ask Santa for a set of 2.0 |
|
|
|
| Mark Henry |
Nov 15 2005, 06:55 PM
Post
#3
|
|
that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Yes
|
|
|
|
| Tom Perso |
Nov 15 2005, 07:17 PM
Post
#4
|
|
Crazy from the Cold... Group: Members Posts: 647 Joined: 8-August 03 From: Kalamazoo, MI Member No.: 1,003 |
Yup, you betcha. Bore 'em esp if they are stock German metal. They'll hold tolerance better.
Tom |
|
|
|
| Jake Raby |
Nov 15 2005, 07:25 PM
Post
#5
|
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Yep-
Your best bet is to send me those for cores and buy my 96mm set based on bored cylinders. When boring cylinders they must be done in a torque plate and things like skirt clearance and cylinder roughnessaverages can add guesswork and increase the chaces of having a bad experience... |
|
|
|
| Thorshammer |
Nov 15 2005, 07:49 PM
Post
#6
|
|
Senior Member Group: Members Posts: 749 Joined: 11-November 03 Member No.: 1,335 |
He's right! The only proper way to do it. Thats why I made the plate for my six cylinder engine. The only way. Everything else is just not acceptable.
Erik |
|
|
|
| Tom Perso |
Nov 15 2005, 08:40 PM
Post
#7
|
|
Crazy from the Cold... Group: Members Posts: 647 Joined: 8-August 03 From: Kalamazoo, MI Member No.: 1,003 |
I sent Jake a set of 94's, my pistons and rings.
They came back perfectly matched. Those slipper skirt 96's were a PERFECT fit and that thing ran GREAT. Good work, quick turnaround, and I knew the job was done by someone who really cared about the product, not the receipt of payment. Tom |
|
|
|
| Jake Raby |
Nov 15 2005, 08:44 PM
Post
#8
|
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Thanks Tom....
And that was what, 4 years ago??? I have the process down to a science- it took a while to get it there too... And yes- That plateau finish on the cylinder wall ROCKS! |
|
|
|
| Cap'n Krusty |
Nov 15 2005, 08:46 PM
Post
#9
|
||
|
Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Here we agree. Machinists familiar and set up for motorcycle work might be able to do it, but they're few and far between. The Cap'n |
||
|
|
|
||
| lagunero |
Nov 15 2005, 08:52 PM
Post
#10
|
|
Donkey Member Group: Benefactors Posts: 1,042 Joined: 8-January 04 From: orange county,ca Member No.: 1,531 |
Is it possible to send a set to a machine shop, say Rimco and simply give them the size that you'd like them bored to (96mm KB) and assume they will work or did I just ruin my cylinders too?
|
|
|
|
| Aaron Cox |
Nov 15 2005, 08:55 PM
Post
#11
|
|
Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: Corona, CA Member No.: 219 Region Association: Southern California |
like jake said, and like twystd1 explained to me....
they needed to be under a torque plate when honed/bored. imagine the change of shape they take from set on a table, to torqued in a motor. they may look out of round etc when all alone, but when torqued up, could be perfect.... |
|
|
|
| Jake Raby |
Nov 15 2005, 09:00 PM
Post
#12
|
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
If they don't ask for your piston go ahead and hang up the phone on them... Here tenths of thousandths of and inch can make or break the results...
How do you KNOW the size that you want them bored to?? Are you guessing?? Is it 3.7785 or 3.7790 or 3.7815???? There is much more to it than just saying "Ummn, I have these 96mm pistons and I need these cylinders bored to 96mm.." what about running clearance?? What about the hone specifics?? Can Rimco do it- Yes... They have done it for me before, years ago.. BUT That was years ago- Only you will know if they ruin the cylinders, when you have an issue. It amazes me just how much people will try NOT to do things the proven, tested and smartest way- You guys must TRY to make things hard for yourselves! JEEZ! Hell I think its time to put the OLD AVATAR back up- thats the way I feel after doing all this homework for guys to TRY and make things hard and expensive for themselves! |
|
|
|
| MattR |
Nov 15 2005, 09:32 PM
Post
#13
|
|
Advanced Member Group: Members Posts: 3,279 Joined: 23-January 04 From: SF Bay Area Member No.: 1,589 Region Association: Northern California |
Jake, they went to rimco. I talked to Todd and used your name with your specs with pistons in my hand. I did my homework almost a year and a half ago and had this engine assembled with all the machine work done by rimco. Now, with 20 minutes on the engine, its all fucked up.
I have a machinist i TRUST in there now looking at everything. I'm doing my research so I dont have to be a wide eyed kid in his shop. I'm doing my homework on the board. Ive spent countless hours searching here and STF and talking with the machinist and people I trust about engines. |
|
|
|
| Twystd1 |
Nov 15 2005, 09:39 PM
Post
#14
|
|
You don't want to know... really..... Group: Members Posts: 2,515 Joined: 12-September 04 From: Newport Beach, California Member No.: 2,743 |
|
|
|
|
| Jake Raby |
Nov 15 2005, 09:42 PM
Post
#15
|
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Matt, what happened to the engine??
Rimco's work is not what it used to be.. |
|
|
|
| MattR |
Nov 15 2005, 09:43 PM
Post
#16
|
||
|
Advanced Member Group: Members Posts: 3,279 Joined: 23-January 04 From: SF Bay Area Member No.: 1,589 Region Association: Northern California |
I dont really want to bash them on a public forum... I'll send you a PM about it. |
||
|
|
|
||
| Jake Raby |
Nov 15 2005, 09:45 PM
Post
#17
|
|
Engine Surgeon Group: Members Posts: 9,398 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Hell, just call me 706 219 4874 I am by the phone doing DAMN PAPERWORK all night tonight... (literally)
|
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th May 2025 - 10:12 AM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.