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Main : Mechanical : Engine Rocker shaft spacers

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Rocker shaft spacers
Rocker shaft spacersPopular
SubmitterddgonzalMore Photos from ddgonzal   Last Update2006/4/30 19:11    Tell a friendTell a friend
Hits3319  Comments8    0.00 (0 votes)0.00 (0 votes)
For high-rpm A-series engines, the spacers replace the stock springs. Apparently they reduce rocker & valve wear that occurs only at high rpm.

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Poster Thread
stirlingmac
Posted: 2006/5/1 7:45  Updated: 2006/5/1 7:45
Home away from home
Joined: 2000/5/6
From: Wellington New Zealand
Posts: 962
 Re: Rocker shaft spacers
To stop the alloy galling I would use some thin bronze washers either end of the alloy spacer, or make the spacers from bronze to start with.

Poster Thread
cheater_5
Posted: 2006/5/1 10:44  Updated: 2006/5/1 10:44
No life (a.k.a. DattoMaster)
Joined: 2005/8/8
From: The garage, NZ
Posts: 1922
 Re: Rocker shaft spacers
SWEET
Just my stupidity showing but why would bronze be best ??

Poster Thread
1200coupe
Posted: 2006/5/1 13:03  Updated: 2006/5/1 13:03
Home away from home
Joined: 2003/9/17
From: Canberra
Posts: 512
 Re: Rocker shaft spacers
stirlingmac,
I actually used bronze thrust washers with my allow rocker spacers. I didnt go into it in the other thread because I was trying to keep my explanations simple. Fitted them wherever a rocker egde came directly in contact with any post edges, I did this just incase but in theory the alloy should be OK because if the rocker to valve stem alignment is right and the oil clearance end floats set properly, Bronze shouldnt be needed. Plus of course it's a little heavier than T6061 - every little bit matters

Poster Thread
2332owner
Posted: 2006/5/1 13:15  Updated: 2006/5/1 13:15
No life (a.k.a. DattoMaster)
Joined: 2003/5/5
From: Okinawa, Japan
Posts: 1292
 Re: Rocker shaft spacers
So what's your recommended clearance?

Poster Thread
1200coupe
Posted: 2006/5/1 13:23  Updated: 2006/5/1 13:23
Home away from home
Joined: 2003/9/17
From: Canberra
Posts: 512
 Re: Rocker shaft spacers
Set all end floats to 0.003" (hot) to keep everything wet whilst still locating the rocker axis centrally over the centreline of the valve stem.

Poster Thread
A14force
Posted: 2006/5/2 7:10  Updated: 2006/5/2 7:10
No life (a.k.a. DattoMaster)
Joined: 2003/12/3
From: Christchurch NZ
Posts: 3704
 Re: Rocker shaft spacers
I thought the idea behind these bushes was to prevent the standard springs from compressing, and bending the pushrods through the rocker arms migrating along the shaft.

Poster Thread
cheater_5
Posted: 2006/4/30 21:50  Updated: 2006/4/30 21:50
No life (a.k.a. DattoMaster)
Joined: 2005/8/8
From: The garage, NZ
Posts: 1922
 Re: Rocker shaft spacers
any dissadvantages? Noise maybe ??
Just interesting to see

Poster Thread
1200coupe
Posted: 2006/5/1 4:07  Updated: 2006/5/1 4:07
Home away from home
Joined: 2003/9/17
From: Canberra
Posts: 512
 Re: Rocker shaft spacers
No dissadvantages with this modification. There is no noticable noise especially considering they are most useful in very high rpm applications.