The Cal-look Lounge
Welcome,
Guest
. Please
login
or
register
.
Did you miss your
activation email?
November 01, 2024, 01:34:40 am
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length
Thank you for your support!
Search:
Advanced search
351146
Posts in
28650
Topics by
6850
Members
Latest Member:
Bugstar70_new
The Cal-look Lounge
Cal-look/High Performance
Pure racing
anyone tried spark plug indexing?
« previous
next »
Pages:
[
1
]
Author
Topic: anyone tried spark plug indexing? (Read 2717 times)
alex d
Hero Member
Posts: 1033
anyone tried spark plug indexing?
«
on:
April 01, 2008, 14:59:48 pm »
yes, no? where would be better to face the gap?
Logged
Jon
Administrator
Hero Member
Posts: 3214
12,3@174km/t at Gardermoen 2008
Re: anyone tried spark plug indexing?
«
Reply #1 on:
April 02, 2008, 06:13:30 am »
I have learnt to point it halfway over to the exhaust valve, but I don't know if it does anything for a normal VW combustion camber.
Logged
Grumpy old men have signatures like this.
alex d
Hero Member
Posts: 1033
Re: anyone tried spark plug indexing?
«
Reply #2 on:
April 02, 2008, 11:33:00 am »
oh well, I'll give it a try, in fact I have to find some really thick washers as the plugs protrude too much into the chamber
Logged
Dominick Luppino
Sr. Member
Posts: 323
Re: anyone tried spark plug indexing?
«
Reply #3 on:
April 02, 2008, 19:10:39 pm »
I tried it, no HP gain. It was a lot of work for nothing…
Logged
Scott Novak
Newbie
Posts: 12
Re: anyone tried spark plug indexing?
«
Reply #4 on:
April 03, 2008, 10:01:56 am »
I index my spark plugs. I can't afford dynamometer time so I don't really know if it is making much difference. But at the very least, I think it should help the cylinders run more uniformly.
Initially I pointed the outer electrode midway between the intake and exhaust valve. However, I noticed that the coloring around the spark plug insulator wasn't uniform on either side of the outer electrode. So now I point the electrode a little more towards the intake valve, and the spark plug coloring is uniform on either side of the outer electrode.
The other reason that I index my spark plugs is to make sure that the threads don't project into the combustion chamber where they could heat up and cause pre-ignition.
For better or worse I'm running a semi-hemi combustion chamber with a very low 6.8:1 compression ratio.
My spark plug gaps are set at 0.065" (1.65 mm) and I use a Jacobs Pro Street ignition and Jacobs Ultra Torquer Coil. I'm using a Mallory vacuum advance Magnetic Breakerless Ignition (MBI) distributor with the larger 208M 8-cylinder distributor cap modified for 4-cylinder use.
Scott Novak
Logged
Pages:
[
1
]
« previous
next »
Jump to:
Please select a destination:
-----------------------------
Cal-look/High Performance
-----------------------------
=> Cal-look
=> Pure racing
=> Technical stuff
=> Top Racers lists
=> In Da Werks
-----------------------------
The Cal-look classifieds
-----------------------------
=> For sale!
=> Wanted
-----------------------------
Happenings
-----------------------------
=> Happenings
=> Scandinavian Cal-look Classic (the event)
-----------------------------
Tyre kicking
-----------------------------
=> Off Topic
Loading...