FI engine tolerances??

Reply Subscribe

Thread Tools

Search this Thread

10-16-2007, 01:47 PM

TN94Z

TECH Fanatic

Thread Starter

iTrader: (14)

Join Date: Sep 2003

Location: Tennessee

Posts: 1,311

Likes: 0

Received 0 Likes on 0 Posts

FI engine tolerances??

Where can I find engine tolerances for a FI build?

Reply Like

10-16-2007, 08:48 PM

DeltaT

TECH Addict

iTrader: (5)

Join Date: Jun 2005

Posts: 2,404

Likes: 0

Received 1 Like on 1 Post

It's really just ring tolerances. Check with your preferred ring mfg. Federal Mogul makes Hellfire rings for FI, and they have a chart based on use and boost, nitrous, whatever you want.

Jim

Reply Like

10-16-2007, 09:19 PM

99mongooSS

TECH Resident

iTrader: (4)

Join Date: May 2007

Location: Denton, Tx

Posts: 778

Likes: 1

Received 1 Like on 1 Post

the rings just need to be low tension rings, right?

Reply Like

10-17-2007, 07:30 AM

TN94Z

TECH Fanatic

Thread Starter

iTrader: (14)

Join Date: Sep 2003

Location: Tennessee

Posts: 1,311

Likes: 0

Received 0 Likes on 0 Posts

Thanks. I just wanted to make sure.

Reply Like

10-17-2007, 03:12 PM

Firechikn

TECH Enthusiast

iTrader: (15)

Join Date: Jul 2005

Posts: 678

Likes: 0

Received 0 Likes on 0 Posts

Piston to wall tolerances will change also. Your pistons should have a spec card telling you what it should be. I know the Diamond race pistons require a lot of clearance for a max effort engine.

Reply Like

10-17-2007, 07:48 PM

helicoil

9 Second Club

iTrader: (104)

Join Date: Aug 2006

Posts: 1,826

Likes: 22

Received 266 Likes on 101 Posts

Rings

Quote:

Originally Posted by 99mongooSS

the rings just need to be low tension rings, right?

I would not recommend low tenision rings for a forced induction max effort engine. Keeping oil out of the combustion chamber should be more of priority than picking up 3% HP from low tension oil ring expanders.