[Fot] Zinc Additive. now use of BRONZE GUIDES

[n197tr4 at cs.com]

Sent: Thu, Nov 3, 2011 8:25 am
Subject: Re: [Fot]   Zinc Additive.  now use of BRONZE GUIDES


 FROM TED SCHUMACHER:

Why dont you use bronze guides?  How did you come to this decision?


Ted,

I discussed with highly regarded performance engine shop.
Whenever they encounter bronze guides they clearance them.
If it doesnt get done, there is a danger of seizing.....which can get very
hard on lifters and cams.

Some engineering folks tell me that cast iron guides provide superior
performance.
And say that bronze cause more heat/friction/wear......................

This and observing various failures over the years caused me change.
Certainly it is the right decision for me.

Others may have a different conclusion and I would invite them to discuss on
this list.

I have long suspected that there have been a lot of failures attributed to
'soft lifters', and faulty cams, when it may have been caused by seizing of
valves or severe drag in bronze guides.

Thanks for asking Ted.   It seems like it is an important subject for this
list.

Joe Alexander







-----Original Message-----
From: tedsimx <tedsimx at bright.net>
To: n197tr4 <n197tr4 at cs.com>
Sent: Wed, Nov 2, 2011 8:54 pm
Subject: Re: [Fot]   Zinc Additive.


Why don't you use bronze guides?  How did you come to this decision?  Ted


Connected by DROID on Verizon Wireless


-----Original message-----

From: n197tr4 at cs.com
To: lang at isis.mit.edu,  JAR7U at hscmail.mcc.virginia.edu
Cc: fot at autox.team.net
Sent: Wed, Nov 2, 2011 21:16:11 GMT+00:00
Subject: [Fot]   Zinc Additive.


 Use of bronze guides is or can be an issue here.

ESPECIALLY those not properly clearanced.

It ALSO seems that cast iron guides are 'slippery' while bronze can create
added friction and wear.

We dont use bronze guides anymore.