Fuelling.

[algtj]

I was having a rather in depth conversation with my very clever (can't spell geneous!) mate a couple of days ago.<br>
It goes some thing like this, <br>
<br>
"Blah blah, facts, figures, blah, blah 480 BHP from my chevvy engined VW Camper, blah, blah EFI, fully mappable, blah, blah, designed and built myself."<br>
<br>
There is always a fine line between being a geneous and being insane.<br>
Dave stradles the line!<br>
<br>
So I turned his attention to the Sprint engine, naturally!<br>
<br>
He is contemplating this at the moment.<br>
<br>
What I would like to know is, how come the fuelling modification process seems only to extend to carbs on Sprints,<br>
is the limiting factor the intake manifold?<br>
<br>
Does anyone have a pictures, plans or drawings for a fuel injection/ bike carb/throttle body system being used or has been used.<br>
<br>
I must stress the idea behind this is for smoother road use not for racing!

<p></p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... b>algtj</A> at: 12/8/06 9:58 am<br></i>

[tinweevil]

Limiting factor in the intake path is / should always be the valve curtain area. Cam therefore fits into the fuelling bracket and is often touched, dunno if there's room for bigger valves.<br>
The second biggest factor in fuelling is the quality of the fuel charge i.e. carbs, injectors or whatever. <br>
<br>
Tin<br>
<br>


<p>1978 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/704">Dolomite Sprint</a><!--EZCODE LINK END--> Blue, a bit tetley. - Current daily drive.<br>
1972 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/754">Spitfire IV</a><!--EZCODE LINK END--> No name, in bits.<br>
1968 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/705">GT6 II</a><!--EZCODE LINK END--> Little blue, nice!<br>
1973 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/755">Dolomite Sprint</a><!--EZCODE LINK END--> VA41, seriously tetley.<br>
1980 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/864">Dolomite 1500HL</a><!--EZCODE LINK END--> Orange, really quite tidy.</p><i></i>

[LewisK]

Quite a 'few' fuel injected Sprints trolling about - mostly using Jenvey throttle bodies, as they're Weber patterns so fit to the Weber manifold.<br>
<br>
Bogg Brothers can supply you with a custom made manifold, set of appropriately tuned Bike carbs for 330 quid all in......<br>
<br>
Got quite a bit of info but tired, so can't type. RSI is giving me grief <!--EZCODE EMOTICON START >: --><img src=http://www.ezboard.com/images/emoticons/mad.gif ALT=">:"><!--EZCODE EMOTICON END-->

<p><!--EZCODE IMAGE START--><img src="http://www.antchip.com/sig2.jpg"/><!--EZCODE IMAGE END--><br>
<!--EZCODE FONT START--><span style="font-size:xx-small;"><!--EZCODE ITALIC START--><em>Crazy! I mean like so many positive waves, we can't lose! You're on!</em><!--EZCODE ITALIC END--></span><!--EZCODE FONT END--></p><i></i>

[ALG1K]

its a lot of work for minimal gains <!--EZCODE EMOTICON START :hat --><img src=http://www.ezboard.com/images/emoticons/pimp.gif ALT=":hat"><!--EZCODE EMOTICON END--> <br>
better fuel economy <br>
better transiant fueling on gear change <br>
better torque curve<br>
more top end power<br>
better starting<br>
Thats if you get it MAPPED correctly<br>
on your after market ecu<br>
On just the gear changes you have <br>
fast gain <br>
slow gain <br>
fast decay <br>
slow decay<br>
throttle adder <br>
throttle multiplier<br>
And that is just to get the AFR to stay as close to what you set it at on cruise on your gear changes<br>
You could always run a closed loop lambda<br>
which keeps the fueling a stoich (14.7.1)

<p></p><i></i>