[Fot] Video from yesterday at Arizona Motorsports Park

Tue Apr 8 00:42:20 MDT 2025

Hi Lyman, 
You can get a thick Remflex gasket that should seal that manifold right up.  I think Brian has those at BFE.  There’s also the HP gasket that moss sells. That splits the differenence between stock and really thick… also made to seal finicky manifolds.
Hope that helps!Dave G

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On Tuesday, April 8, 2025, 1:04 AM, Lyman Scherer via Fot <fot at autox.team.net> wrote:

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On Apr 7, 2025, at 9:23 PM, Lyman Scherer <lymanazhd at yahoo.com> wrote:

 2- 40 DCOE, fuel pressure changes 4-5psi now 4.5psi
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On Apr 7, 2025, at 9:21 PM, Lyman Scherer <lymanazhd at yahoo.com> wrote:

 It is intake leakage.. with stock gasket (stainless covered with fiber material) have blown #4 and #1 ports at different events. Have used same gasket on same BajaTR3 engine for 7 years, dozens of events, 1000’s of miles without failure!Variable is: TR4 intake and headers that came with #65 car.Systems checked: solid 150+ compression, plugs great! cones grey w/ no oiling, valve clearances not changing set .016” intakes .018” exhaust, timing & advance ok 20’ idle 32’ advance, carb jetting from past only richened main.Solution? Crappy sealing surface clamping of intake/exhaust stud hardware. Or fab soft copper gasket?
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On Apr 7, 2025, at 5:54 PM, Dave  Riddle via Fot <fot at autox.team.net> wrote:

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Yes on the Webbers. Fuel pressure seemed good as did the color of th eplugs

Dave Riddle

602.692.5276

From: David Gott <triumphsix at yahoo.com>
Sent: Monday, April 7, 2025 4:47 PM
To: Dave Riddle <dave at microworks.net>; FOT (fot at autox.team.net) <fot at autox.team.net>
Subject: Re: [Fot] Video from yesterday at Arizona Motorsports Park

Just because I’ve missed this myself and watched others do the same; check timing.    I take it you are running webbers if you mention jetting?  Curious about fuel pressure…

Normally would sound like detonation if you lose midrange; possible if you have an intake leak even with low compression.  What do the plugs look like?

I’m likely stating the obvious things, but sometimes the simple is overlooked….

Hope that helps,

Dave Gott

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On Monday, April 7, 2025, 7:39 PM, Dave Riddle via Fot <fot at autox.team.net> wrote:

https://youtu.be/MQjU3jhW7Y8

Took the TR4 out in an HPDE3 Session to test how she’s handling. I like how she handles but we have developed a lean condition.  Revs fall flat between 4-5k then come back between 5-6k.  Changed jetting and that did not really help. Neither did hotted plugs. Lyman checked valve adjustments. That was not the issue either. It is odd however that we are blowing out the intake gaskets but no issue with the exhaust gaskets.

Lyman figures we are running about 90 hp at the wheel. Hopefully putting it on a dyno next month will help find the lean issue and maybe some more hp from this low compression engine.  This is the motor (and 5 speed Toyota) that was in the Baja Car which needs low compression to deal with low quality fuel in Mexico.  This fall a rebuilt high compression engine along with a 4 speed Triumph box will be installed.

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Dave Riddle

Business IT Consulting

Office: 480.610.8234

Cell: 602.692.5276

eMail: dave at microworks.net

Website: http://www.microworks.net

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