Subject: Re: [Fot] SU needle recommendation for Kent Cam (or something else?)

From: Greg Blake via Fot <[email-masked]>
Date: Thu, 16 May 2024 20:00:58 -0500

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>Dave,&nbsp;</div><div><br></div><div>I=
 chased this longer than I=E2=80=99d like to admit. The TR3 acted, to me, li=
ke it wanted more fuel so I always kept trying to solve a lean condition or a=
 fuel starvation issue.&nbsp;</div><div><br></div><div>I finally broke down a=
nd installed an O2 sensor and AFR gauge, like you have. Guess what, I had to=
o much fuel. At the time using RC needles in HS6 SUs with air horns and no f=
ilter. Engine is 87mm 12.5:1 with a 298 cam.&nbsp;</div><div><br></div><div>=
Sorry don=E2=80=99t recall the needles I swapped to but they were slightly l=
eaner and motor no longer stumbles at 5500. In fact it came alive.</div><div=
><br></div><div>Your AFR of 10.5 sounds a bit rich to me.&nbsp;</div><div><b=
r></div><div>That said, falling flat at half throttle under load sounds like=
 something else.&nbsp;</div><div><br></div><br id=3D"lineBreakAtBeginningOfS=
ignature"><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><bl=
ockquote type=3D"cite">On May 16, 2024, at 17:57, Mike Harmuth via Fot &lt;f=
[email-masked]&gt; wrote:<br><br></blockquote></div><blockquote type=3D"c=
ite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr">Dave, here's a link to an on=
line SU needle comparison program. Select your carb size and then add needle=
s&nbsp;from the pull down to compare them. The RC and RA have different curv=
es but end up in about the same place.<div><br></div><div>&nbsp;How's your t=
iming? Is the advance working? Check your throttle linkage, are you getting t=
he butterflies&nbsp;fully open?&nbsp;<div>Compression check out OK? Do you h=
ave another set of plugs? Did you re-check rocker clearance? Cam timing&nbsp=
;off?<br><div><br><div><a href=3D"http://www.mintylamb.co.uk/suneedle/">http=
://www.mintylamb.co.uk/suneedle/</a><br></div><div><br></div><div><div>&lt;i=
mage.png&gt;</div><br></div></div></div><div>Good luck</div><div><br></div><=
div>mike h</div></div></div><div id=3D"DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"=
><br><table style=3D"border-top:1px solid #d3d4de"><tbody><tr><td style=3D"w=
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/div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On=
 Thu, May 16, 2024 at 4:51=E2=80=AFPM David Gott via Fot &lt;<a href=3D"mail=
to:[email-masked]">[email-masked]</a>&gt; wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex"><div>
Hi FOT,<div><br></div><div>Just put a Kent TR4-7 cam in my TR4; 300 duration=
. &nbsp;3 laps at Summit point so far, and past half throttle under load, po=
wer cuts and air fuel enrichens to 10.5:1.&nbsp; BUT plugs are white.&nbsp; &=
nbsp;Was running an RC needle from the old cam, tried RA and not much improv=
ement.&nbsp; Even when moving adjustment to full lean.&nbsp; The last test s=
ession is cancelled, so want to see air a best guess on a needle to try - fi=
gure someone must have experience with this cam and SU=E2=80=99s. &nbsp;11.3=
:1 compression=E2=80=A6.&nbsp;<br><br>Also, just put in a new HD condenser j=
ust in case it=E2=80=99s an ignition problem.</div><div><br></div><div>Any i=
deas or thoughts?&nbsp; Won=E2=80=99t be able to test the condenser until qu=
alifying tomorrow, but air file holding steady at 2500 rpm shows 11.5:1 whic=
h seems way rich; old cam would be lean under those conditions.</div><div><b=
r></div><div><br></div><div>Thanks for any ideas!!</div><div><br></div><div>=
Dave Gott<br><br><div><a style=3D"font-size:12px" href=3D"https://mail.oneli=
nk.me/107872968?pid=3Dnativeplacement&amp;c=3DGlobal_Acquisition_YMktg_315_I=
nternal_EmailSignature&amp;af_sub1=3DAcquisition&amp;af_sub2=3DGlobal_YMktg&=
amp;af_sub3=3D&amp;af_sub4=3D100000604&amp;af_sub5=3DEmailSignature__Static_=
" target=3D"_blank">Sent from Yahoo Mail for iPhone</a><br></div></div>
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