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Twin Dellorto 45s on a 1400cc?

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lee4391 Part of things Posts: 107	Twin Dellorto 45s on a 1400cc?lee4391 @lee4391
	Feb 5, 2013 8:45:49 GMT Select Post Deselect Post Link to Post Back to Top
	Hi, I have a honda civic and last year bought i bought a manifold and twin 45 Dellorto DHLA's destined to fit a 1590cc twin cam engine. I currently have a 1400cc D14A1 engine in the car as that's what it came with from standard and i love it to say the least, its responsive, revvy, potent and sounds brilliant, and i am becoming a little reluctant to swap it out for the 1590cc motor as i like it so much. I have recently found someone who has a manifold for the dellortos for my current 1400cc engine, but i don;t really want to go through the hassle of selling the 45s and getting 40s etc etc. Better the devil you know and all that. The chart below denotes that a 35-36mm chokes would be suitable for a 140cc engine revving to 7.5k RPM which is its current 'rev limit'. Although 35-36mm seems almighty large in the grand scheme of things especially when thats the type of chokes size you find in two litres albeit torquey low revving ones(6-6.5k RPM). Does anyone have any opinions on whether it will be okay or run like poop etc etc. I have seen 1380cc minis running twin 45s so i reckon it will be fine. I would also plan to fit a more aggressive cam and have it revving round to 8k RPM, which I'm sure would necessitate the larger 45s... Any info/previous experiences would be brilliant. Cheers lee.
	Fast road/Track 1991 civic - retrorides.proboards.com/index.cgi?board=readersrides&action=display&thread=118905&page=1

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jrevillug Posted a lot Posts: 3,520	Twin Dellorto 45s on a 1400cc?jrevillug @jrevillug
	Feb 5, 2013 11:51:10 GMT Select Post Deselect Post Link to Post Back to Top
	Well 30mm chokes have been used on 875cc Imp engines with great success, so 35mm seems reasonable. And yes, for a given engine size, revvier means bigger carbs. And more power.
	Caution: As the buoys marking the shoals are often out of position, mariners are cautioned to be on their guard when navigating these shores 75 Imp 72 Clan - What? An update? Never!

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stealthstylz Club Retro Rides Member Posts: 14,841 Club RR Member Number: 174	Twin Dellorto 45s on a 1400cc?stealthstylz @stealthstylz Club Retro Rides Member 174
	Feb 5, 2013 12:41:44 GMT Select Post Deselect Post Link to Post Back to Top
	They should be fine, you might lose a bit of throttle response low down but with a cam it won't matter anyway.


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lee4391 Part of things Posts: 107	Twin Dellorto 45s on a 1400cc?lee4391 @lee4391
	Feb 7, 2013 19:15:52 GMT Select Post Deselect Post Link to Post Back to Top
	Just what i wanted to hear. It lacks low done torque anyways.
	Fast road/Track 1991 civic - retrorides.proboards.com/index.cgi?board=readersrides&action=display&thread=118905&page=1

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westyxflow Part of things Posts: 17	Twin Dellorto 45s on a 1400cc?westyxflow @westyxflow
	Feb 7, 2013 21:03:32 GMT Select Post Deselect Post Link to Post Back to Top
	As others have said, I reckon they'll work fine Just checked using the dave andrews jetting program and it also suggests 35mm chokes for a 1400cc at 7500 rpm. It suggests the following jets as a starting point on dellortos: Choke - 35mm Mains - 140 Emulsion - 7772.7/7772.6 Air - 180 Idle - 40/7850.2 Pump - 30/35 Aux venturi - 7838.3 35mm chokes will have much more venturi effect in a 45 body rather than a 40 body so may not be as rubbish on the bottom end as you might think


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bountyhunter Part of things Posts: 441	Twin Dellorto 45s on a 1400cc?bountyhunter @bountyhunter
	Feb 7, 2013 23:18:19 GMT Select Post Deselect Post Link to Post Back to Top
	tbh 45mm is overkill on an engine this size if it were me, id look for a pair of 40mm dellorto/webers and sell the 45's bonus is that 40's are generally cheaper, so you could actually make a few ££££ on the deal


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squonk Part of things Posts: 858	Twin Dellorto 45s on a 1400cc?squonk @squonk
	Feb 8, 2013 16:18:01 GMT Select Post Deselect Post Link to Post Back to Top
	I reckon that this will be virtually undrivable at anything below full throttle. 45mm is way over size for such a small capacity engine. I suspect that the economy will be horrific too. You may also find that the hydrocarbons will be too high to pass the MoT.
	2004 Chevrolet Avalanche Z71 2005 Mercedes CLK320 Cabriolet 1996 Mercedes C180 Elegance Auto Saloon 1996 Rover 620Ti (Dead fuel pump) 1992 Toyota HiLux Surf 1987 Range Rover Vogue (Rusty) 1992 Range Rover Vogue SE (More Rusty) 2006 Chrysler Grand Voyager 2008 Corsa 1.4 Design

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welshpug Posted a lot Posts: 4,334	Twin Dellorto 45s on a 1400cc?welshpug @welshpug
	Feb 8, 2013 17:48:17 GMT Select Post Deselect Post Link to Post Back to Top
	I know puggers use 40's on a 1.6 8 valve 205, and 45's on the 1.9 and the 16valvers. A little different, but the best TU5 engine Sandy Brown has built to date runs 230 bhp through 42mm Bike bodies.
	ZX 16v, 205 GTI. my ZX's project thread - retrorides.proboards.com/thread/151997/16v-project-pt2-power-upgrades

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