924Board.org

'79_924 · Joined: 13 Mar 2003 Posts: 33 Location: London, Ontario

okay i have some questions. i was thinking about changing my CIS system to carborated and was wondering what parts i would need (ie manifold, carbs) and is this better for running say a supercharger?

another, i was also thinking of doing the P&P, camshaft and header back exhaust upgrade. i was wondering if it mattered it i got the cam first or would it not increase HP without the P&P. thoughts on this would be very helpful. im not going to be doing these mods right away as i have no money, and still am trying to get the engine running right

thks
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'79 924 - in the works

"It's not how u stand by your car, it's how u race your car"

Capt EZ · Posted: Mon Mar 24, 2003 11:16 am Post subject:

I respect a guy with foresight, sorry I can't answer your questions!
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Dream as if you'll live forever.
live as if you'll die today. - James Dean

Fly Fast
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1987 924S

'79_924 · Joined: 13 Mar 2003 Posts: 33 Location: London, Ontario

thks for the post, can anyone answer my questions. i need to know so i can start sorting out and saving $$$$
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'79 924 - in the works

"It's not how u stand by your car, it's how u race your car"

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

have you read the posts in this section by AFBCamaro about his recent carb conversion?

Would also suggest that a more descriptive topic title might help.
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1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

'79_924 · Joined: 13 Mar 2003 Posts: 33 Location: London, Ontario

no i havent read them, i will though.
_________________
'79 924 - in the works

"It's not how u stand by your car, it's how u race your car"

epsylon · Posted: Tue Mar 25, 2003 2:37 am Post subject:

i am in the process of a similar conversion. if you upgrade to a wild cam the stock CIS will perform poorly at idle ( carbs can be tuned to help with poor idle ). i would first upgrade to a free flow exhaust, as this upgrade can be done with the stock CIS in place. then i would switch to carbs and then upgrade to the wild cam. while upgrading the cam get the head ported and polished.

the dual carb conversion i am doing requires:

2 X Weber 40 DCOEs
Weber Mainfold
Throttle Linkage
Low PSI Fuel Pump
Fuel Pressure Regulator
Fuel Lines / Hoses
Choke Line / Cable If Desired
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'82 931
'78 928
Howell Henderson
South Padre Island

Lizard · Posted: Tue Mar 25, 2003 3:57 am Post subject:

it is going to be easier to install a supercharger with carbs , the cam will do alittle bit w/o a P&P and exhaust , but probably not alot, but if you have another daily driver, I would say save up and do everything all at once, also would help if it was on a fresh rebuild for reliability
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3 928s,

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

if you're going to do a port job yourself try and get a good look at a 931 (turbo) head before you start. Don't just charge in with a dremel you could make it worse than it already is.

Basically on the intake ports you want to fill in the lower lip, flatten out the floor and raise the roof slightly. If you're converting to carbs then it's a good time to do the ports properly because once you have you'll need a new intake manifold.
_________________
1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

'79_924 · Joined: 13 Mar 2003 Posts: 33 Location: London, Ontario

i was going to wait till the end of summer to do the conversion, I should have enough money by then. do i have to buy a conversion kit, or could i piece together my own? and is there a VW or Audi header that will fit on the 924 head? im trying to cut costs here.

i dont have access to many turbo heads in my area or many 924 in general. do you have pics of one Peter? cause i prolly will be doing my own p&p to save some money.

i dont have my G2 yet so i cant drive the 924 yet, so it will be possible to do it piece by piece if need be
_________________
'79 924 - in the works

"It's not how u stand by your car, it's how u race your car"

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

I've got a 931 and a couple of 924 heads tied up under the house. I'll see if I can get some decent pics of the ports.

When you do the intake ports you'll spend more time filling than grinding.

New carb conversion kits are non-existant. The come up on ebay every couple of months. Depending on your skill, time and equipment-level you could build a manifold yourself. We're just talking two pieces of aluminium stock and some bent pipe and a bit of welding or JB Weld.

Use the search (it works now) and search for author afbcamaro and read about his dellorto conversion. Send him an email.
_________________
1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada

Just a tip: If you want more people to help you, get their interest. Change your topic to "changing my CIS system to carborated" I bet you'll get more opinions.
P.S. I'm still new to engine repairs, sorry I can't help.

'79_924 · Joined: 13 Mar 2003 Posts: 33 Location: London, Ontario

does anyone know the cost of the conversion kit from weber. kit # K 294?
this is the kit with the 2 40DCOE's and the cannon manifold. any thoughts on this kit, worth the $$. or would piecing together my own kit be cheaper?
_________________
'79 924 - in the works

"It's not how u stand by your car, it's how u race your car"

jpab924 · Posted: Tue Mar 25, 2003 2:24 pm Post subject:

weber conversion kit for your 924 will cost in the range of 12-1300 us dollars. You get the manifold, 2 40 dcoe carbs, low press. fuel pump, fuel press. regulator, and linkage. The fuel line you can get yourself from the auto parts store.

A couple of sources for a weber conversion:

www.redlineweber.com
www.paeco.com
www.jameng.com ---good prices for the parts you will need here

I bought mine for half that price. They occasionally will pop up on ebay. You can try doing a search there.

weber carbs do not have a provision for ported vacuum on them.(for distributor adv.) You have to improvise and drill out one of the carbs at the proper location and install a vac. port. I have done this and it was not too difficult. But, I still have not installed the carbs yet to find out if there will be enough ported vac. for the distributor adv. AFBCamaro used dellortos for his conversion. He mentioned his dellortos had a provision for ported vacuum. He has not posted here in a while.

Either way, if you buy a conversion kit, be aware that the carbs may not be ready jetted. There is a procedure to fine tune your carbs and find the correct choke size and jetting for your particular application.

wdb · Joined: 02 Nov 2002 Posts: 2024

if you get a manifold made up by a machine shop or other metal fabricator, you can use ANY carberator from ANY similar size engine . a new holly carb for a 2-2.5L engine will run about $250. , a used scrap yard carb can be had for $75-$150 or if you know anyone who has a none running car,you might get a carb and manifold for free, but the carb will need to be rebuilt and the manifold cut and or modified to fit. rebuild kit should run $10-$50 depending on year and make of the car it is for . prolly better to go with chevy or ford , many available .as for what year to go with , 1960's- 70's would be cheaper, and have less things like emmissions and electric chokes to deal with . there are prolly guides to this type of stuff in the hot rod magazines , try a search of the web , to find a good,cheap,easy,carb to use, then have the manifold made up .or you could just pay the 1300 and have someone else do the leg work of putting it all in an easy to use package .

'79_924 · Joined: 13 Mar 2003 Posts: 33 Location: London, Ontario

thks for the info. cant decide wether to go with the kit, or to piece my own together from diffent companies. has anyone had any experince with this kit? and what make of low flow fuel pump do they use, and the linakge.
_________________
'79 924 - in the works

"It's not how u stand by your car, it's how u race your car"