That's heading towards what I used to run in the racing car. You'll be better off with 45 DCOE Webers running 36mm chokes.
hi guys , i need help with carby sizing for my 4k ..
it is a 4k 60 over size , very ported, bigger valves
cam is pretty big the specs are
duration :294/298 valve lift : 415 /426
power range is from 2900-8700rpm lol
i thought i might get away with a 32/36 or twin 40s with 33chokes
any info would be good
cheers
That's heading towards what I used to run in the racing car. You'll be better off with 45 DCOE Webers running 36mm chokes.
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Toymods founding member #3
what model head are you running
1985 RT142, 1GGTE,.now with t67-25g
2009 Ford Fiesta LX
1970 Ford Cortina MK2 440
remember to machine down the rocker towers.
ITB injection will be leagues ahead. 7KE lower manifold would be ideal.
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Mmmmmm, ITB equipped 4K.
Member Of The Leaf Sprung Axle Trampers Club
Fixing the rocker/valvetrain geometry.
|| 91 MX83 Cressida Grande 1JZGTE - Daily || 84 MA61 Supra 2JZGE - Track ||
yeah ok, sounds nasty
Member Of The Leaf Sprung Axle Trampers Club
My choice would be 40mm with #34 chokes, but I am Old School.
The Weber would be an under performer and limit you top end power.
Buy a dual sidedraught Redline Manifold as a starting point. Then you can go carbs or twin Dual Barrel ITBs with the same bolt pattern.
A totally set up ready to bolt on and run dual 40mm Solex for that manifold combination is around $900 including cable and linkage.
EFI is better for overall drivability and gives the ability to control AFR better. There is always the debate over outright power outputs between this and carbs. Price depends on cost of ITBs, levers and ECU chosen. Again I would pick an ITB that has tapered bores and throttle plate size of 40mm or the 43mm as per the second link below.
http://www.efihardware.com/products/...hrottle-bodies
http://www.efihardware.com/products/...s-45mm-to-50mm
Either combination aims to give as much air speed as possible and balance this with outright total air capacity, considering that there will not be much drivability in that engine combination anyway.
Both carbs and ITBs can use the same cable and balance bar linkage that would be added onto the manifold.
Do you have a light flywheel?
Regards
Rodger
yer i have a slightly lighter flywheel , i like the idea of itbs but the sound of 40-45 is very nice and im trying too keep the car old school but in saying that a injection setup with a megasquit or haltech would be epic for tuning willl 20v itb from a silver top fit to a older toyota manifold with small modification????
Small mod I do not know. They will not fit on the original k manifold without a lot of cut and shut alloy welding. The 20v ITBs do not have the same bolt pattern as the sidedraught so cannot be easily adapted to the Redline manifold either.
Regards
Rodger
ok well my mate is an engineer and alloy welding machine lol so maybe he could do something for me , what do efi 7k come out in unless anyone wants to sell me some twins lol
Ok
Now we are down to asking. What do you want to do with this motor?
An adapted efi from a 7k will achieve only so much and will be limited by the single throttle body size effectively like putting the Weber 32/36 on.
Regards
Rodger
Machining the rocker posts solves an issue that puts the rocker on such an angle at full lift that the push rod fouls the rocker at the adjustment ball/screw and the head could drop off the side of the valve. It brings the rotation angles about the shaft back to the OEM position.
Amount is determined by a combination of cam lift and how much was removed from the head when raising compression. Once the motor is assembled then it can be checked as the cam is dialed in and valve clearances checked.
If enough is taken off, the head bolts need to be checked to see if they bottom out, then packed up with a washer or shortened or head studs get used.
Regards
Rodger
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