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<div>Is there a chassis dyno near you?</div>
<div> </div>
<div>If the fuel pump is inadequate or the carb is jetted wrong the mixture will go lean at full throttle and high revs, and you would learn that on a dyno.</div>
<div> </div>
<div>I don't know what mixture condition you'd see if the carb is just too small.</div>
<div> </div>
<div>When I got my Dino the carbs had been changed to another type of Weber. The chassis dyno showed the mixture to be too lean and the (points) ignition breaking up at high revs. Holley fuel pump, rejet carbs on dyno, and electronic ignition took care of the problems. </div>
<div> </div>
<div>Jim </div>
<div> </div>
<div> </div>
<div></div>
<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">-----Original Message-----<br>
From: Asa Jay Laughton <asajay@asajay.com><br>
To: detomaso <detomaso@poca.com><br>
Sent: Sun, Dec 8, 2013 12:36 pm<br>
Subject: [DeTomaso] Carb and fuel pump<br>
<br>
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Hi all,<br>
<br>
This year (2013) at the Silver State Classic Challenge, I recorded a
top speed in the trap of 130.7 MPH. When I reached the countdown to
the trap I was already doing just shy of that to bank time before
the Narrows. I consciously pressed the accelerator a bit more to
push her up to a goal 135 MPH, but nothing happened.<br>
<br>
I speculate at 130 MPH, I'm using up all the carb, or all the fuel
pump. One, the other, or both.<br>
<br>
The Carb is a Ford stamped Holley list with these numbers:<br>
<pre>D8PE-9510-KA
LIST 8414
3113
</pre>
This link shows my email back in 1999 with info from Holley that I
obtained.<br>
<a class="moz-txt-link-freetext" href="http://poca.com/detomaso/1999-09/329.html" target="_blank">http://poca.com/detomaso/1999-09/329.html</a><br>
Apparently it's a 600 cfm. it has vacuum secondaries and
three-quarter turn emission lockouts on the mixture screws. I've
put a standard rebuilt kit through it once or twice. It's been a
really good carb, but I don't know it will pull more than 130 MPH.<br>
<br>
What to do.<br>
As always, money is a bit of an issue. I'd like to install EFI but
that's really expensive.<br>
I'd like to keep it responsive at low rpm like she is now, but still
have the throughput needed at higher rpm at top speeds. I think
this leans me toward a vacuum secondary rather than mechanical. I'm
sure the cfm needs to be cranked up, but would 650 do it or should I
head for 700 or higher?<br>
<br>
Does anyone have one they'd be willing to part with?<br>
Should I send mine into someone like Chuck Nuytten and have them do
their magic on it, replacing metering blocks and other mods?<br>
Should I just buy a new one?<br>
<br>
The engine is a 351C bored .030 over, stock stroke.<br>
Heads are <a>DOAE</a>, <a>quench</a> chamber.<br>
Cam is a Crane hydraulic roller with these specs<br>
<img alt="" src="cid:part1.09010403.08010708@asajay.com"><br>
Intake is an FPP 4145<br>
Stock ZF transmission<br>
<br>
I've got some time so I'm looking for some informed/experienced
opinions on what carb would be best.<br>
<br>
And since Professor Engles from the Midwest Division of the Pantera
Research Institute is engaged with Fuel pump questions, I'll just
follow his thread on that part. :)<br>
<br>
Thanks,<br>
Asa Jay<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
Asa Jay Laughton, MSgt, USAFR, Retired
& Shelley Marie
Spokane, WA
******************************
<a class="moz-txt-link-freetext" href="http://www.racingagainstautism.com" target="_blank">http://www.racingagainstautism.com</a>
<a class="moz-txt-link-freetext" href="http://www.teampanteraracing.com" target="_blank">http://www.teampanteraracing.com</a>
<a class="moz-txt-link-freetext" href="http://facebook.com/racingagainstautism" target="_blank">http://facebook.com/racingagainstautism</a></pre>
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