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Re: [OM] [OT]silica/silicone

Subject: Re: [OM] [OT]silica/silicone
From: Jim Brokaw <jbrokaw@xxxxxxxxxxx>
Date: Fri, 31 May 2002 23:23:17 -0700
on 5/31/02 12:18 PM, Tom Scales at tscales@xxxxxxxxxxxxxx wrote:

> The, ahem, Corvette uses an aluminum block.  I believe it is 'unlined', but
> could be wrong.
> 
> Tom
> 
>> I'm pretty sure most makers using aluminium blocks use steel sleeves or
>> liners.  Like you, I may be  and am quite likely dead wrong.
>> 
>> BTW, the Vega wasn't the first iteration of this type of motor meltdown.
>> American Motors tried it in '62 and '63 with one of their straight six
>> motors....  with quite similar results.
>> 

If I recall correctly, the Vega engine block used a high-silicate aluminum,
with the bores etched to expose the silicate substrate. This was supposed to
avoid the need for cylinder liners... we had a 1974 Vega, bought new. Within
a year it was using 1 quart of oil in 500 miles... we traded it for a Honda
Civic... In later years GM first lined the cylinder bores with iron sleeves
then went to an iron engine block (the "Iron Duke" engine). I think most
current aluminum-block engines use iron sleeves.
-- 

Jim Brokaw
OM-1's, -2's, -4's, (no -3's yet) and no OM-oney... 


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