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fred cook's Avatar
 
Join Date: May 2001
Location: Deep South
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Twin Plug, bottom plug question

Other than using the ARP head nuts, is there any way/tool available to install the bottom plugs on a twin plug head? The stock lower head nut protrudes just enough to block the plug socket! These heads were already drilled and tapped for 14mm plugs (top and bottom) when I bought them. I am using the NGK BPR6ES plugs, at least for the initial startup.

Thanks,

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FEC3
1980 911SC coupe "Zeus" 3.3SS
god of thunder and lightning
Old 06-11-2013, 06:33 AM
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Typing error

That should be Raceware head nuts, not ARP. My bad!
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FEC3
1980 911SC coupe "Zeus" 3.3SS
god of thunder and lightning
Old 06-11-2013, 06:45 AM
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Just went through this, you can use standard VW air cooled engine head nuts on these head studs, the plug removal tool or a plug socket then fits. I am using the same plugs you are.

I have to credit Steve at Rennsport Systems for this, he is the one who answered the same question for me.

W
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1972 Targa, nothing matching.
Looking for motor 6124265 and transmission 7720299
Old 06-11-2013, 08:22 AM
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Another way.........

Quote:
Originally Posted by swade View Post
Just went through this, you can use standard VW air cooled engine head nuts on these head studs, the plug removal tool or a plug socket then fits. I am using the same plugs you are.

I have to credit Steve at Rennsport Systems for this, he is the one who answered the same question for me.

W
I just finished fixing the problem another way. The interference between the head nut and the plug socket is very small. I removed each of the head nuts that were in the way and ground a small 45 degree bevel (approx. 3mm x 3mm) on the top end of the nut. I did not take off enough metal to compromise the integrity of the head nut, just enough to allow the plug socket to slide by. I did each, one at a time and retorqued the nut before moving on to the next one. The standard plug socket now just barely slides by the offending head nut, but it works!
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FEC3
1980 911SC coupe "Zeus" 3.3SS
god of thunder and lightning
Old 06-11-2013, 09:11 AM
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Henry Schmidt's Avatar
 
Join Date: Apr 2004
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We use NGK BKR 6 EKUB or BOSCH FGR 6 KQE.
These plugs have 14mm thread but use a 5/8' or 16mm socket.

Of course with Supertec head stud plug clearance is never an issue.
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Old 06-11-2013, 09:58 AM
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Aw come on...........

Quote:
Originally Posted by Henry Schmidt View Post
We use NGK BKR 6 EKUB or BOSCH FGR 6 KQE.
These plugs have 14mm thread but use a 5/8' or 16mm socket.

Of course with Supertec head stud plug clearance is never an issue.
Henry,

I know that the Supertec head studs and associated hardware is tops. And thanks for the tip on the other spark plugs. But, cut me some slack here, I at least bought and am using a set of the Supertec engine air diverter tins!

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FEC3
1980 911SC coupe "Zeus" 3.3SS
god of thunder and lightning
Old 06-11-2013, 10:04 AM
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Henry Schmidt's Avatar
 
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Hey Fred, you can have all the "slack" you need. The statement was designed to inform those who don't have your knowledge.

I just noticed a missing nut, no "slack" here.

Cheers

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Henry Schmidt
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Email: supertec1@earthlink.net
Old 06-11-2013, 10:20 AM
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Missing nut......

Quote:
Originally Posted by Henry Schmidt View Post
Hey Fred, you can have all the "slack" you need. The statement was designed to inform those who don't have your knowledge.

I just noticed a missing nut, no "slack" here.

Cheers

Thanks for the heads up. I found that missing nut right after this picture was taken! Actually, I appreciate all of the input that is available from this board! What an incredible wealth of knowledge!

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FEC3
1980 911SC coupe "Zeus" 3.3SS
god of thunder and lightning
Old 06-11-2013, 10:57 AM
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