[Fot] Fwd: FW: TR6 Cannon Intake Manifold

[Allen Washatko]

I'm running valve seat pressure of 110 lbs closed and 285 lbs open @. 
500 lift on my TR6 race engine.
On Sep 16, 2015, at 8:57 AM, Kas Kastner wrote:

>
> 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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Allen Washatko
#6 Triumph TR6




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