2T Single Cam upgrade help

[king-szeitszam]

G'day guys,

Just looking for some info/advice/help regarding 2T cam upgrades.
I'm in the Brisbane area and need recommendations on places to do this, what to ask for etc.

Has anyone had experience in this? What kind of benefits can I expect?

Thanks in advance

[NME308]

Hi there mate,
I personally recommend the guys at Wade Cams as I have had good results and service from them.

You havn't mentioned what you are aiming for with this upgrade or what else is or is not done to the engine.

If you are looking for the universal 'moar powah' fix then the cam, carb, and extractors route will keep you amused for a while! A cam just by itself would not necessarily be a startling improvment. A decent cam and springs with the above mentioned carb and exhaust upgrade will be best bang for your money you will ever get from one of these. Like most engines the amount of power available is strictly governed by your wallet size...

I would start with an honest chat to the likes of Wade Cams and they will give you an honest cam recommendation.

Cheers,
Jason

[parrot]

I also swear by Wade's. Many many years ago I put their 169 grind in my 2T.

But that was in combination with a ported & shaved head and extractors. Nothing silly, but it went like the clappers. At different times I ran twin 40mm webers or a 32/36 DCD downdraft carb.

I never touched the bottom end, thrashed it as all young blokes do, did motorkhanas, clubsprints and autocrosses and drove it to work everyday.

Don't be tempted to go too wild, and make sure you get your followers refaced. I think a 121 was the next grind up then, but the 169 was great.

[lt1972]

To help aid with this question. The car is fitted with 2.5" exhaust with high flow rest and muffler. Also currently being upgraded with twin sidedraught mikuni's off 2tg, so exhaust and carbies are there to enhance all upgrades. More than likely will have a custom cold air intake to the twins as well.

[ctrain]

I have a 270 cam and 4-1 genie extractors, im thinking of getting a 32/36 weber, but are there any other better downdraft carbies for this setup. My dad had a 350 holley on his and he said it ran great and made a good power increase, anyone know of other carbies to suit this setup?

[king-szeitszam]

There's a beautiful Weber on eBay set up and jetted specifically for a 2T engine- going for 850 last I checked.

Myself- I've gone for the twin side draft setup like the 2TG on my 2T.
I would recommend this- massive power boost and sound and look very tough.

If you can find a set of those contact Anthony on here and he'll make an adapter for you for a price.

[Hurricane]

run down the page, i ran a wade 446b in my first 3tc build worked really well, was my daily also, my motor was stock inside with new rings, gaskets and seals. balanced, heavier valve springs, shaved head, 18rg 40mm's, 4 -1 headers. i highly suggest a alloy or light steel flywheel also. i had mine lightend on that motor to start with and it worked, but when i used the alloy flywheel it was even better (no lose of down low power ether). an elec dizzy is somthing i never got around to doin but could be good also

[king-szeitszam]

run down the page, i ran a wade 446b in my first 3tc build worked really well, was my daily also, my motor was stock inside with new rings, gaskets and seals. balanced, heavier valve springs, shaved head, 18rg 40mm's, 4 -1 headers. i highly suggest a alloy or light steel flywheel also. i had mine lightend on that motor to start with and it worked, but when i used the alloy flywheel it was even better (no lose of down low power ether). an elec dizzy is somthing i never got around to doin but could be good also

Elec dizzy installed! Whole ignition system perfect really, starts instantly even in the cold with a bit of choke to help.

Okay, here's the deal with the cam, as I've talked to a couple experts and also had the twin carbies tuned/balanced.
basically I need a single cam mod that will allow for the massive increase in fuel flow.
Single cam can't deal with the current flow, especially when accelerating harder than normal- just dumps fuel out the back really.

Looking for a set up with a longer dwell and faster open/shut to cope with more fuel going through.
Dont really want an aggressive cam, just one to help the economy and provide a little more power (naturally it would do this as the engine will actually be able to take in the fuel im pumping into it.)

Looking at a few engine reconditioners who offer such services around the Redlands, one such business being RLC Reconditioning in Capalaba.
Anyone had any experience with them?

[NME308]

I'm shaking my head here trying to clear it...

You have just been to the totally wrong people if your carbs have supposedly been tuned and the engine is still dumping fuel out the pipes under acceleration!!! Do not, I repeat, do not let these guys touch anything else on your car.

Talk to wade cams (melbourne I think) or tighe cams (in Brisbane I think) or any other genuine cam grinder for an honest cam recommendation and for the love of all things sane ditch the 'carb experts' who butchered the poor carbs!

I'm running an agricultural 650cfm double pumper 4 barrel holley carb on my 3TC and don't have metering issues like these guys have managed to induce into your somewhat sophisticated pair of carbies.

I guess what I'm trying to say is that a camshaft WILL NOT correct what some goosewhits have done to your carburettors!!!

Cheers,
Jason

[king-szeitszam]

You have just been to the totally wrong people if your carbs have supposedly been tuned and the engine is still dumping fuel out the pipes under acceleration!!! Do not, I repeat, do not let these guys touch anything else on your car.

Damn, I guess that's what $50 an hour gets you these days

I'll give Tighe cams a ring tomorrow as they're sort of local.
So would a good plan of action be to get the new cam done by them, then have the carbies re-tuned to suit that grind?
Definitely will not be returning to the previous 'tuners'.

I think I'm lucky to get 15l per 100 km on fuel currently. I can't afford to drive this car! Two trips to town and back and half my tank is gone.

At a loss of what to do in the meantime!

[river]

Hi,

If you are worried about economy then I question your need for twin carbs and a more aggressive cam.

You can have...
- Performance
- Reliability
- Economy

Pick two.

seeyuzz
river

[king-szeitszam]

G'day River,
Let me rephrase- better economy. The 15l per 100km I'm getting at the moment is a bit steep!
I was told that a single cam motor is simply not designed for a twin carb set up, and for it to run as efficiently as possible it would need a cam upgrade.
Longer dwell, faster open and shut of valves and the fuel would actually be able to flow properly. (so i'm told)

Again, i don't really know. I'm just repeating what I've been told, and that was "Get a better cam".

Edit: I have a single carb that I can rebuild, re-jet and the whole lot. If push comes to shove and I can't get the fuel usage down with these twin mikuni's, I'll take them off and put the single downdraft back on, freshly rebuilt.
I guess my way of approaching it is that a mild cam mod may improve the efficiency of the fuel-guzzling twin carbs, to an acceptable 10l per 100km- or at worst case scenario I put the single carb back in and it has a nice new cam upgrade anyway.

I'm open to any advice at all. Was I lied to when told that the 2T single cam cannot handle such fuel flow? Would a cam help?

[NME308]

Haha River my wife also questions my need for 30sumthing year old daily dirver with turbo installed, this however does not stop me trying to better my 9.4L/100km highway fuel useage!

For someone who knows a carburettor a stock cam is easier to tune as it will usually have nice high manifold vacuum readings and give a nice smooth signal with minimal vibrations to disturb everything (relatively speaking). The car is going to respond positively power wise to a cam upgrade and as long as you take it to someone who actually knows carbs (an old timer or someone who has actually raced with multiple carbs would help) it should still be able to get better mileage than 15/100 on the highway!

A few years ago I had to learn how to tune 4 barrel Rochester carbs found on some V8's as no one local did anything other than make things worse and take my money for the priveledge... Ultimatly you would benefit heaps from learning to tune those carbs yourself!

Cheers,
Jason

[king-szeitszam]

Thanks Jason! Big help- I think I will start learning how to tune this set up- sounds a lot cheaper and less headache-y.

The way I've interpreted much of what you said is that if I want fuel usage on or around the 10/100 mark, I need a single carb motor. Is that more or less true?

I just got off the phone to Tighe cams, who are happy to do a mild cam upgrade including cam followers for about $260. It'll increase torque and low/mid power, while of course giving some benefits top end too.
He said it SHOULD (fingers crossed) help with the efficiency a little, I say again, a little- not really what I wanted to hear :frown:

Any advice from anyone on the matter? Should I stick with the twin carb set up, get a cam upgrade and hope for the best, or ditch the twin set up and downgrade to the single carb, and possibly get a cam upgrade anyway to help make up the power a little?
i had hoped that simply tuning the twin mikuni's very lean would help bring the consumption down, but it's through the roof and far higher than anyone I'd talked to predicted!

Thanks for all your help so far guys. Slowly but surely getting there.

[ctrain]

I would get a weber 32/36 its the most common and the easiest to work with, theres a dual throat weber on ebay at the moment, that would go great with a 2t, theres no point running twin carbs on a 2t, i really wanted twin carbs, but trying to do all 3 upgrades (twin carbs,cam and extractors) is too much of a hassle and you'll probably regret it. a 32/36 weber would be my choice or a holley 350.

Peace Out