1300 tuning

[algtj]

Any idea's anyone?<br>
Will 1500 twin carbs help or hinder.<br>
Over to you Jod!? <!--EZCODE EMOTICON START :lol --><img src=http://www.ezboard.com/images/emoticons/laugh.gif ALT=":lol"><!--EZCODE EMOTICON END-->

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[Dolly Bird]

I've had 4 years experience from a previous 1500 twin carb dolly and that was nothing but hassle<!--EZCODE EMOTICON START :( --><img src=http://www.ezboard.com/images/emoticons/frown.gif ALT=":("><!--EZCODE EMOTICON END--> petrol overflow after petrol overflow, no matter what I did to it! If I had the choice I'd stick to a single carb, a lot more reliable IMO.

<p>Debs<br>
Custodian of "Molly the Dolly"<br>
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[davepoth]

but power wise, I guess a bit better. I guess somewhere there's a manifold to fit a single HS4 instead of HS2s, might give you a bit more poke.

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[Jod Clark]

What's the project Al?

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[Stan Part]

Done this on my 1300 dolomite around 10 years ago, marginal improvement, I think time would be better spent porting and improving the exhaust manifold before doing this to get any significant change.

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[Jon Tilson]

twin carbs are great and the fuel overflow problem is down to an over active pump or dirty float valves. Right pump and an inline filter gives no hassle.<br>
Good heat shield is an esential.<br>
I run the triumph tune manifold on my spits which isnt an option for the doly sadly. Its supposed to make all sorts of difference but it costs me about 3 mpg over the cast siamesed port original but at least the anual flange gasket fix is no longer needed. Its a bit quicker I suppose but then that could just be the twin boxes.<br>
If I had some spare carbs I'd stick them on my 1300 and give it a try...the std 1300 inlet manifold is crap.<br>
John Thomason of Spit fame reckons a single carb and a maestro manifold works well IIRC.<br>
Go for it...<br>
Better still..fit a slant 4 (dives for cover)...<br>
<br>
Jonners <br>


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[Jod Clark]

Of course, fit a Slant 4! With warp-o-matic head, drip-o-matic water pump and blowing-out-the-thread-o-matic spark plugs. Sorted. <br>
<br>
You were expecting it Jonners and I'd hate to make you feel let-down <!--EZCODE EMOTICON START :) --><img src=http://www.ezboard.com/images/emoticons/smile.gif ALT=":)"><!--EZCODE EMOTICON END--> <br>
<br>
jod

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[dollyboy]

<br>
my tolly has a single carb, engine is smooth and sweet all through the rev range but it has the mid range power of a c90 moped. this will get upgraded to twin hs4's, spit manifold stylee.<br>
<br>
my current se has twin hs4's, its got enough grunt for what its intended for, will happily tick over at close to stall speed, but has obviously been cared for through its life unlike my 1st one, which I basically battered <!--EZCODE EMOTICON START :lol --><img src=http://www.ezboard.com/images/emoticons/laugh.gif ALT=":lol"><!--EZCODE EMOTICON END--> <br>
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I'd go twin carbs every time. as long as they're in a good state, clean, set up right, no leaks and needles not worn i dont see how a single carb would be better... unless its a holley or weber!<br>
<br>
<!--EZCODE EMOTICON START :lol --><img src=http://www.ezboard.com/images/emoticons/laugh.gif ALT=":lol"><!--EZCODE EMOTICON END--> <br>
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ps - jod, you're so mean. slant up, baby, you know it makes sense!

<p>project orange - slow progress<br>
project black - coming on, could be sold...<br>
project white - pimp my tolly, next year!</p><i></i>

[Dolly Bird]

.... I've got to stand up for myself here<!--EZCODE EMOTICON START :) --><img src=http://www.ezboard.com/images/emoticons/smile.gif ALT=":)"><!--EZCODE EMOTICON END--> I fitted new valves, needles, in-line fuel filter, new pump, cleaned them out (on several occasions!), balanced them etc, but still I had problems<!--EZCODE EMOTICON START :( --><img src=http://www.ezboard.com/images/emoticons/frown.gif ALT=":("><!--EZCODE EMOTICON END--> Short of fitting new carbs, which at the time were way out of my price range, I despaired and just soldiered on for four years! I got quite used to sniffing petrol in the end<!--EZCODE EMOTICON START :eek --><img src=http://www.ezboard.com/images/emoticons/eek.gif ALT=":eek"><!--EZCODE EMOTICON END--> Maybe that's why I went out and brought exactly the same model (even the same colour) earlier on this year<!--EZCODE EMOTICON START :lol --><img src=http://www.ezboard.com/images/emoticons/laugh.gif ALT=":lol"><!--EZCODE EMOTICON END--> The fumes obviously cooked my remaining brain cells<!--EZCODE EMOTICON START :rollin --><img src=http://www.ezboard.com/images/emoticons/roll.gif ALT=":rollin"><!--EZCODE EMOTICON END--> Twin carbs ....... ummmmm ...... say no more<!--EZCODE EMOTICON START : --><img src=http://www.ezboard.com/images/emoticons/ohwell.gif ALT=":"><!--EZCODE EMOTICON END-->

<p>Debs<br>
Custodian of "Molly the Dolly"<br>
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[2F45T4U]

Jod and Jonners are right. Dolly engines are crap<br>
<br>
Time for a V8 <!--EZCODE EMOTICON START :D --><img src=http://www.ezboard.com/images/emoticons/happy.gif ALT=":D"><!--EZCODE EMOTICON END-->

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[algtj]

I may or may not be adding to the collection........ a 1300 powered vehicle.<br>
I was thinking in terms of building a little race car or something, thus the question.<br>
I do have more modern engines knocking about but thought of keeping it period.

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[slant04]

I remember reading an interesting article in the tssc Courier mag about 8 years ago about somone experimenting with single vs twin carbs on a spit. Twin carbs only come into their own at about 4500 + rpm. He found the low down torque and reduced fuel consumption was much beeter balance than the little added performance. I'm not sure if they are able to supply a reprint

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[Jod Clark]

I'm in!

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[Jon Tilson]

That was the John Thomasson article that also used the different inlet manifold. I cant remember exactly but I think it was a bigger HIF single SU and manifold of the S series engined maestro. I also think the electronic ignition dizzie came from the same car. We are talking comparison with the std single SU on a dolly 1300 here.<br>
<br>
The BL boys took a similar view with the MG metro and the A series, fitting single big SU's to that as well. I reckon that was just cheapskate.<br>
<br>
So the jury is out for me. What I do know is that twin SU's on a spit will see a nice drive and 40 ish to the gallon. Unless you are Jod and have access to tuning facilities a ohv four will not give a dolly the sort of performance every owner should experience. If you take John's view with the single SU then he's saying no benefit above 4500 rpm. Rubbish. No ohv 4 is capable of revving that high long enough to find out....without luching the crank.<br>
I suppose Jod's comments are applied to the TR7 lump he flogged me...which after sitting outside in the rain, filling with water for a year and being partiall seized (my fault not Jod's), still manages to drag around my scruffy old thing at inappropriate speeds after running happily for 2 years.<br>
Jonners<br>
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[algtj]

Jod, we will carry this conversation on over the weekend!<br>
My 1500 will rev to 4500 all day long.....<br>
So far! <!--EZCODE EMOTICON START :D --><img src=http://www.ezboard.com/images/emoticons/happy.gif ALT=":D"><!--EZCODE EMOTICON END-->

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