I run 110lbs seat pressure and 235lbs open. The TR6 sees 8,000 rpm's.
Allen
Sent from my iPhone
> On Feb 15, 2017, at 2:31 PM, patrickmannion1--- via Fot <fot at
> autox.team.net> wrote:
>
> I agree with Brian's figures. He has been reliably racing his TR powered
> Morgan for years. David Newman (Newman Cams England) was saying 110 on the
> seat and I think 225 at full lift was sufficient (I'll look at my notes this
> weekend re other cams and pressure at full lift).
> We saw a lot of engines with way too much valve spring pressures causing wear
> and robbing horse power.
> Weight of valve train components, valve size, collet retainer material, ect
> all play a factor and checking for coil bind is critical.
> Sealed Power make a range of valve spring shims thicknesses that will
> increase you spring pressure, I have part numbers and thicknesses but am
> unable to get back home right now with mudslides and road closures here in
> Santa Cruz. Greg Solow (Santa Cruz CA) and Dema Elgin (Santa Rosa CA) have
> years of experience with various cams and valve spring set ups for TR3/4
> engines.
> Pat Mannion
> Santa Cruz CA
>
>
> ---------- Original Message ----------
> From: davehogye via Fot <fot at autox.team.net>
> To: Jason Ostrowski <jason at multivintage.com>
> Cc: Friends of Triumph <fot at autox.team.net>
> Subject: Re: [Fot] valve spring pressure on TR4 race engine
> Date: Wed, 15 Feb 2017 05:05:46 +0000 (UTC)
>
> Yes! Let's hear some wisdom on this subject from Santa Cruz. Greg, please
> guide us with your knowledge.
>
> DH
>
> From: "Jason Ostrowski via Fot" <fot at autox.team.net>
> To: "Peter Vucinic" <pvucinic at netspace.net.au>
> Cc: "FOT" <fot at autox.team.net>
> Sent: Tuesday, February 14, 2017 7:52:41 PM
> Subject: Re: [Fot] valve spring pressure on TR4 race engine
>
> This post has been swirling around in my head all day... Since We have always
> run 65 lbs closed pressure for the GT6 motors with several different cam lift
> scenarios... My initial thought and answer for Tim's inquiry would have been
> that 85 lbs seems just fine. I almost posted 85lbs seems just fine as if I
> really know what I'm talking about. And as I thought about it; the variables
> of stroke, size, height, wet liners, etc. may have all types of influence on
> the settings. With all that in mind I figured that I didn't have any reason
> assume that what we do with the GT6 would be at all applicable to the
> original inquiry. But I really wondered why his machinist would think that
> 85lbs is "light".
> Then the trusted voice of my mad German speed demon pipes in and says that
> it should be higher by an off the chart amount of poundage!
> Since he runs so well with a certain amount of reliability and obvious speed;
> it remains of interest to me (with now less understanding than prior to the
> original post) to fundamentally backtrack the inquiry of spring pressure
> theory.
> It seems that a huge # would yield a stronger bounce that would have certain
> benefits. It also seems that a stronger bounce would meet certain limits of
> stress on components and result in dangerous scenarios. Thus, there must be a
> line to cross, a minimum and a maximum.
> Dear Confucius, what say ye to the boundaries of such...and please, oh great
> one, present the essential expose.
> The formulaic dynamic as to the characteristic makeup of proper spring
> pressures is???
> I always look to the west for such guidance, perhaps some wisdom exists in
> Santa Cruz?
> Jason Ostrowski
> Friendly Ghost Racing
> 1969 Triumph GT6+ Racecars
>
> Sent from my iPhone
>
> On Feb 14, 2017, at 7:32 PM, Peter Vucinic via Fot <fot at autox.team.net>
> wrote:
>
> I would be EXTREMELY careful with too high a spring pressure. Been there,
> done that! If you go by all the STD calculations, theories and what you
> ?should have? texts. It will tell you need HIGH springs pressures. Destroyed
> a couple of cams that way! I just went back to springs with about the seat
> pressures you are looking at. Haven?t had an issue with cams/cam lobes since.
>
>
>
>
>
> "You can Make a Small Fortune From Motor Racing. As long as You Started With
> A Lage Fortune!"
>
> Kind Regards
>
> Peter Vucinic
>
> TR4 - TR7 V8 - Spitfire MkII
>
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> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of timmmurphh---
> via Fot
> Sent: Wednesday, 15 February 2017 6:56 AM
> To: fot at autox.team.net
> Subject: [Fot] valve spring pressure on TR4 race engine
>
>
>
> I have 85 lbs. pressure on the intake valve with the valve closed and it sits
> at a height of 1.655 inches. At .400 lift, I have 190 lbs. of pressure. We
> only run to 6000 RPM with the gearing we have and the engine we have. The
> valve springs are double springs and the machine shop says they are all about
> the same, very consistent. What pressures would be recommended? The machine
> shop thinks these pressures are light for a 6000 RPM engine. Any advice will
> be appreciated. Thanks.
>
>
>
> Tim Murphy
>
> 1961 TR4 #317 BRG
>
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