Re: IML: Lead Additive

["Burton Bouwkamp" <northburt@xxxxxxxxxxx>]

With high output high speed operation the exhaust valves will wear their way 
into a soft cylinder head. It's a gradual process but if allowed to progress 
it will result in increased spring heights and less spring load which 
permits false valve motion. Also, as the wear progresses the sunken valve 
seat shrouds the exhaust valve and restricts exhaust gas flow. On 
dynamometer durability schedules I've seen seats worn 5/16 of an inch. 
Eventually the valve train "lash" in the hydraulic tappet is gone and the 
tappet will hold the valve off it's seat.

Remember, this problem is directly related to engine output (combustion 
chamber temperatures) and engine speed (valve seating velocity) and 
miles/hours driven. The way our collector cars are driven - I doubt that it 
is a problem. But - just in case - I add 2 oz of STP Lead Substitute every 
time I put 5 gallons of gas in my 1968 Dodge Charger.

Burt Bouwkamp

----- Original Message ----- 
From: "Dan" <sunup@xxxxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Friday, November 10, 2006 2:34 PM
Subject: Re: IML: Lead Additive


> There were a number of posts recently about lead additives but I don't 
> remember anything about "amounts per gallon". I followed the directions on 
> the product I bought of 1/2 ounce per 5 gallons. Considering a half ounce 
> is such a small amount, does this sound right? Also, can someomne tell me 
> what might happen toa 440 or 413 if it is run with premium unleaded gas 
> and no lead additive? If it is harmful, would it be immediate or gradual 
> over time?
>
> I'd also like to join in with thanks to those of you who fought for our 
> freedom. The character and courage of men and women like you is 
> responsible for the freedoms we all enjoy today.
>
> Thanks You!
>
> Dan Collins
> 67 Crown Coupe
>
>
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