redtop on 45's

[Gabbo]

got a 2.0 8v in my car and wanting to put twin 45's on a redtop.
got the redtop engine so what else do i need??
ive herd you have to lower the alt is this true and how is it done??

cheers

[blue_peg_16v]

right you will need manifold linkage fuel pump fuel pressure regulator and either management of a dizzy and wiring from a 1.6 carb cavalier, as for the bracket i never forund the need wi my 48s but when talking to frank at the weekend he had too so you need a lower alternator bracket too

[Gabbo]

so ill need a facet pump wont i and where does every one mount these??

[gaznovalet]

use a R1 motorbike pump has a built in interuptor pump so it knows exactly how much fuel the carbs require at all times and adjusts to suit, dont need pressure regulator or low pressure pump this way. a fitted a redtop in me mates nova and ran it on webbers and the R1 pump was perfect for the job, get them cheap on egay or bike breakers. i mounted the pump to rear of block below carbs, and i didnt have to lower alternator it was fine. blue peg has coverd the rest regarding ignition for them.

[Count Vaux Alot]

See my saloon thread its all in there, only certain type of inlet manifold require you to run an alt lowering bracket, i have a custom alt lowering bracket for sale as well :thumb:

[Gabbo]

cheers for that then lads. :)

[craig green]

All that expense & bother for about 10bhp over the SFi/motonic. It will cold start poorly too. Not worth it IMO. Should sound nice though.

[gavint5]

All that expense & bother for about 10bhp over the SFi/motonic. It will cold start poorly too. Not worth it IMO. Should sound nice though.


ah men brother! why would anybody class stepping back in time 20 years to a technology far surpassed and what should be forgotten, an upgrade? i suppose in this twilight zone we have entered we will all be trading in our xe's and lets for one of stephensons units.
i just cant see the point in it when they are such a ******* to get right and to keep right? your efforts will be better spent giving your engine a good service. if your still not content with that then buy some throttle bodies mate ;) and make your efforts worth while

[gavint5]

i dunno why i just put in such a sensible statement here cos it seems no matter what i do im gonna get greifed with red splodges??? am i due another for bad mouthing dusty old carbs?

[AlexW]

This thing about setting them up right and having to keep setting them up is rubbish. Once setup well they shouldnt need adjusting.

[gavint5]

This thing about setting them up right and having to keep setting them up is rubbish. Once setup well they shouldnt need adjusting.

they will need cleaned though you clown and thats a pain in the **** and when you clean them you need to balance them yawn. all finicky and basically ****. injectors are far superior. if you want more air and more fuel. buy bigger injectors and gas flow your head. dont just go with the trends or we'll see ya in a four door next!!!

[MattBrown]

Carbs can be a pain!

Balancing, Cleaning, setting up for winter/summer, rolling roading, jetting, choke arrangements?

But tbf, fook the rules of physics, and go for it!

Im sure itll fly!

[Geordie-Chris]

What a total load of rubbish about 10bhp gain and being a pain in the **** to set up and maintain!!! Ha ha, I've ran my red top on twin 45 Dellortos for 3 years now with no bother from them, and I've just done a 850 mile round trip to re Nurburgring, including 4 hard laps (for me anyway!!) and it never missed a beat!!. I get them checked every year by the guy that set it up, but it's more for piece of mind, as it only costs £20, and he even tells me himself that they were fine etc. Cold start is no more of an issue than on TBs, trust me, I've had plenty of experience of both. Yes their old fasioned, but they were used back in the day for a reason, they work. If I had £2000 to spend on TBs, and getting them mapped I would, but for reasonably little money I can have a very similar performance gain for a fraction of the cost!
Boils my piss when people shout on how unreliable they are, if their built and set up properly in the 1st place then their fine!!!

[novaxe235]

here here my 48's are spot on and with a decent set of cams you will see a lot more then 10 bhp

[Southie]

Carbs can be a pain!

Balancing, Cleaning, setting up for winter/summer, rolling roading, jetting, choke arrangements?
Is this from personal experience or what you've heard! :wtf:

If carbs are setup correctly by someone in the first place then they will be okay. Obviously like anything carb related they will need servicing but this fallacy about bad running is ridiculous. Would they really be still making weber carbs if they were that bad? I don't think so!!!

[AlexW]

they will need cleaned though you clown and thats a pain in the **** and when you clean them you need to balance them yawn. all finicky and basically ****. injectors are far superior. if you want more air and more fuel. buy bigger injectors and gas flow your head. dont just go with the trends or we'll see ya in a four door next!!!

So have you had experiance of them? I think not.

My old sr had twin 40's on for years without a problem.

[dougie_boi]

the only problems iv found with carbs is they dont like k&n filters in the winter apart from that they brill id recomend them to anybody a dose of redex every few months keeps them sweet

[gaznovalet]

im all for carbs over injection on redtops and thats speaking from several carb expeiences over several years and not one problem, fitted a set of 45s for a freind and set them up myself and still going strong. running them on cossy plugs gapped at .6 helps a lot with any cold start issues shud you have any as not all do. and they look and sound great but that just my opinion clearly ther is mixed views on them but thats same with evrything.

[Gabbo]

well i know bout both ways but like its been said before i cant justify spending £2000 on a set of TBs.

im going for the carbs any ways i just wanted some tips i.e. fuel pump, alt, dizzy and its loom and such.

if any one would be kind enough to pm me about talking these things through and answering some questions that would be great.

cheers :)

[gaznovalet]

pm sent my freind.

[The Simps]

Like any modification you've got to match it up to other mods. A local guy used to always run redtops in his cars as the engines were cheap and for a set of 45s, lumpy cam & machined pistons he was running 250bhp at the flu.

However, yes, TBs are another step better as they give you more control. But they are in a different price bracket.

[gavint5]

So have you had experiance of them? I think not.

My old sr had twin 40's on for years without a problem.


i most certainly have you div! theyve been replaced by a superior device that comes standard on this motor. what do they cost to buy anyway? with all the bits and fitted? just curious as someone gave the impression they where cheap

[dumpycorsa]

I'm running a weber alpha kit on my xe. Twin 45 dcoe's. Basically old technology brought more up to date with the advantages of using mappable ignition.The kit uses dis-pac ignition,throttle position sensor,air temp sensor and original crank sensor. ECU is easily mapped by a local weber specialist. I'm using a red top facet fuel pump and a filter king regulator set to 3 psi. Only problem I've had so far is the main jet covers keep coming un-done (quite a common problem when running solid mounts). Other than that starts fine in the mornings and sounds amazing.

With regard to the alternator. I'm using an SBD inlet manifold. The standard early alternator hits the bottom of the inlet but is easily lowered by drilling some 5mm steel plate with 4 holes to lower the bracket down.1 inch is plenty.Alternatively you could use a small jap style alternator. This is what I've done but it's a little bit more involved.