Re: IML: Lead Additive

["Dan" <sunup@xxxxxxxxxxxxx>]

Burt, thank you for this explanation. It helps to understand what happens 
inside an engine under high speed and hot, extended conditions. Since I 
bought this additive I might as well use it.

Dan Collins
67 Crown Coupe


----- Original Message ----- 
From: "Burton Bouwkamp" <northburt@xxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Friday, November 10, 2006 2:32 PM
Subject: Re: IML: Lead Additive


> 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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>
>
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