Lagondaforum

Subject: Zenith 36 UH - Lagonda 2 Litres Speed Model Setup

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Hi,

My 2 Litres Speed Model is fitted with 2x Zenith 36 UH carburetors since new.

Present I’ve got a jet’s setup of:

-   Main        : 90
-   Compensator     : 125
-   Slow running    : 55

Currently I’m running Newman’s cam’s.

I’m not very happy with setup mainly for two reasons:

-   Running to reach during the summertime (hot air)
-   At high revs, above 4000 rpm’s the car have some hesitation doing quickly more (I would like to reach 4500 rpm’s without hesitation)

Does anyone know or has a better experience than my ?
Does anyone know the setup of the former Lagonda 2 Litres Works cars using twin Zenith ?

Any advice or experience is highly appreciated.
Thank you very much
Best Regards
Igor

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Subject: Re: Zenith 36 UH - Lagonda 2 Litres Speed Model Setup

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Dear Igor,
Unless you have modern type steel connecting rods at least and prefferably a modern counterweighted steel crank also, then you would be EXTREMELY ill advised to go more than 3750 rpm on a regular basis!
Your standard rods have a thickness smaller than your little finger at the small end and this added to a "mean" piston speed of over 3500 feet per minute, and a peak of over 5800!, you are asking for your engine to do a very good impersonation of a hand grenade!

I hope this elevates the need to re-jet your carburettors which must be working well for you to be able to get to 4000+ in the first place!

Regards,
Julian

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