Rick,
The car does already have Dennis Welch tubular manifolds but they are for
use with SU Carbs and so are shaped differently to be able to route around
the carbs. DWR also makes manifolds that are specifically for use with
Webers. Because of the position of the Weber inlet manifolds the 'Weber'
exhaust manifolds can come straight out from the head for several inches
before dipping down, this 'Weber' type cannot be used with SUs. I decided
the cost wasn't worth it as my exhaust manifolds are still in great
condition.
Bob, that's correct, we decided to increase the compression ratio because
of the 300 degree cam.
Derek
On Tue, Mar 19, 2013 at 3:52 PM, Bob Spidell <bspidell@comcast.net> wrote:
> I'm assuming that is 'research' method? The equivalent in the US--which
> uses (R+M)/2 method--would be 91 octane (there's about an 8-pt spread
> around 90-95 octane). That's consistent with our pump gas, which is
> usually 87-, 89- or 91-octane (except in high altitude areas, where you
> sometimes can't get over 89-octane).
>
> The higher overlap cam probably offsets the higher compression ratio.
> Good call.
>
> Bob
>
>
>
>
> On 3/19/2013 8:21 AM, Derek Job wrote:
>
>> As high as you can get!
>> In the UK that means using Shell V Power. It's rated at 99 octane. BP and
>> a few others have 97 octane but it is quite common to roll into a petrol
>> station now and find they only sell the basic grade of petrol which is 95
>> octane.
>> I can also use an additive for competition. Gets a bit expensive though.
>> Derek
>>
>>
>> bspidell@comcast.net>> wrote:
>>
>> What octane gas is required?
>>
>> Bob
>>
>>
>>
>>
>
> --
> ***********************************************************************
> Bob Spidell San Jose, CA bspidell@comcast.net
>
> ***********************************************************************
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