[Fot] Fwd: FW: TR6 Cannon Intake Manifold

[Kas Kastner]

*Never be beaten by equipment.*

---------- Forwarded message ----------
From: Kas Kastner <kaskastner at gmail.com>
Date: Wed, Sep 16, 2015 at 6:53 AM
Subject: Re: [Fot] FW: TR6 Cannon Intake Manifold
To: Van Mulders Marcel <van.mulders.marcel at telenet.be>


The camshaft is the thing that has to determine the spring pressure, but to
me, it seems way way way too light. My TR-3-4 engines with my G-3 camshaft
had 135 pounds on the seat and about 320 open pressure. I realize this will
sound  out of bounds for you but rev range and how much RPM you intend to
use will be a factor.

Do not let them talk you out of the 45mm carbs and I used 40mm chokes in
both the TR-6 engine and even the GT-6 engine even ran on the dyno with NO
VERNTRI and made more power but limited the low rpm smoothness so I never
raced it that way... the factory *1147cc* *Spitfire* engines for Le Mans
and Sebring had 45 mm Webers and made 3% more power.

*Never be beaten by equipment.*

On Wed, Sep 16, 2015 at 1:18 AM, Van Mulders Marcel <
van.mulders.marcel at telenet.be> wrote:

> Thanks to the Fot members for their reactions : most are warnings that
> triple 45 Webers may be too big on a TR6 engine. But it is a race engine
> (2720cc) and the owner has already bought 3 good secondhand 45 Webers with
> identical progression holes : 36mm main venturi's seem  to be a reasonable
> starting point in this case? If necessary, he can go down to 34mm in 45
> Webers.
>  I've seen TR6 racecars with 45 Webers and I wonder if the Cannon
> manifold, with 40mm diameter bores on the carburetor side, can be reamed to
> 45mm?
> Another question : the valve seat pressure on my TR4A racecar is 35 kgs/77
> lbs. I've also a cylinderhead with only 25 kgs/55lbs seat pressure. The
> springs on both cylinderheads are 5.25kg/mm (290lbs/").
> Do you think 25kgs seat pressure is enough?
> Marcel
>
>
> ------------------------------
> *Van:* Van Mulders Marcel [mailto:van.mulders.marcel at telenet.be]
> *Verzonden:* woensdag 9 september 2015 17:32
> *Aan:* 'fot at autox.team.net'
> *Onderwerp:* TR6 Cannon Intake Manifold
>
> I have to install triple  Webers DCOE 45 on a TR6 engine. The owner has
> also provided a Cannon one piece intake manifold with balance pipes. The
> bore of the runners is 40mm on the carburettor side and 31.5mm on the
> cylinderhead side.
> Can these runners be reamed to 45mm/34mm? If not, are there other inlet
> manifolds available?
> Marcel.
>
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