[Fot] Fwd: Video from yesterday at Arizona Motorsports Park

Tue Apr 8 12:13:46 MDT 2025

Lyman,
  I have always had good luck while keeping the fuel pressure as close to 3
psi as possible. Larger diameter fuel line may help with fuel flow while
keeping pressure down.
                                        P.J.

On Mon, Apr 7, 2025 at 10:40 PM Lyman Scherer via Fot <fot at autox.team.net>
wrote:

>
> Sent from my iPhone
>
> Begin forwarded message:
>
> *From:* Lyman Scherer <lymanazhd at yahoo.com>
> *Date:* April 7, 2025 at 9:21:02 PM MST
> *To:* Dave Riddle <Dave at microworks.net>
> *Subject:* *Re: [Fot] Video from yesterday at Arizona Motorsports Park*
>
> 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?
> Sent from my iPhone
>
> On Apr 7, 2025, at 5:54 PM, Dave  Riddle via Fot <fot at autox.team.net>
> wrote:
>
> 
>
> 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
>
> Sent from Yahoo Mail for iPhone
> <https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_>
>
>
>
> 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.
>
>
>
> <http://www.microworks.net/>
> <image001.jpg> <http://www.microworks.net/>
>
> *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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