[Land-speed] BBC Firing Order .

[Skip Higginbotham]

John,
You are probably on the right track. I would think that 5 and 7 firing 
together and being far away from the cam drive gear would impart more of a 
twist to the crank than would 4 and 2. If this is the case, then the rear 
cylinders could be closer to the correct valve timing with the new firing 
order. Dyno tests say it gives a little more power....more is better??!! and 
runs smoother....smoother would imply less interference from harmful 
harmonics. Small improvements sometimes result from subjective 
analysis.......I needed to chage cams anyway......
Skip

----- Original Message ----- 
From: "John Burk" <joyseydevil at comcast.net>
To: "LandSpeed List" <Land-speed at autox.team.net>
Sent: Thursday, June 02, 2011 22:28
Subject: Re: [Land-speed] BBC Firing Order .


> Skip
>
> The altered firing order cam would trade 5-7 interference for 4-2 
> interference  wouldn't it ? Maybe it would reduce crankshaft harmonics by 
> eliminating the normal 7,2 sequence crank twisting .
>
> John
>
>
>
>> My new cam will change the firing order of my BBC to 18736542....this 
>> looks
>> good to me due to getting adjacent cylinders away from firing together.
>>
>> What are the pros and cons?
>>
>> Pros: Smoother running, few more Hp from not having 5 take the charge 
>> away
>> from 7.....?
>>
>> Cons: ?
>>
>> Now I'll have to put the same nozzles in all cylinders...........
>>
>> Skip
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