Hemi 6 into a 40?

[serenity]

Just bought my second cruiser, a 40 series that will become my trail rig.

plans are to swap a chrysler 6 cylinder Hemi 245 or 265 with a TBI into it mated to the stock 4 speed, was wondering if anyone has seen this done before or has done this?

Apart from that the plans are for a full rebuild, with roll cage tube doors, parabolic springs, hopefully lockers and simex centerpedes and a whole ton of other goodies.

 

[lostmarbles]

I recall this thread here that mentioned fitting various sixes:

https://forum.ih8mud.com/40-55-series-tech/214589-slant-6-yah-yah.html

some of the info there may be useful to you

 

[matt.mcinnes]

Have a look at building a 2FE or the 2F with TBI a well built 2F is not a bad option.

https://forum.ih8mud.com/40-55-series-tech/168967-big-gay-2f-build-tech.html

The 2FE is a 2F with a head from a 3FE auto 80 series 90-92. A stock 2FE can be set up with the 80 series ECU. The 3FE head bolts straight up.

 

[serenity]

thanks for the info lost marbles, i would go a v8 except the laws in my state dont allow me to drive a V8 cos im too young. the aussie 265 hemi pulls 203hp stock so with it cleaned up a bit i thought it would do the equivelent job of an 8. they also have quite good torque and fuel efficiency, plus i want to keep it oldschool. are aussie hemi's the same as american? in the other thread it only talks about slants which as far as i know are a different engine.

matt - i had thought about doing a 2fe a few times with my 60 but wreckers around here charge ridiculous rates for parts, and i have access to 3 hemi's for $150.

other plans include building my own intake manifolds and a TBI.

 

[Cruiser_Nerd]

The 245 / 265 was never available in the States. It "should" be the same as swapping in the slant 6 as it was the same family, I think. If you're talking the EFI 3.9/3.7 V6 "hemi" we got in later years they're useless pieces of crap.

I've never seen curves for the 245/265, but I'd bet both the torque and horsepower peaks are at much higher rpms than the F/2F. Really you would be hard pressed to beat the off idle - low end torque of an F or 2F, just depends on what you want out of the motor.

 

[serenity]

nope not the V6, the old straight 6, peak torque and power are only about 200rpm above the 2F's although i havent seen a curve for either a 2F or hemi 6, i dont mind revving a bit harder this rig will be a toy hopefully use it in comps. i know from my mates valiant that 265's pull hard at low revs even on 5 cylinders with blown rings and 1.3 million miles on the clock.

would the stock 40 series radiator handle a hemi or will i have to modify something bigger to fit?

 

[matt.mcinnes]

You can see here the effect going to the 4ltr 3FE had on torque, the shorter stroke moved peak torque to 3000rpm over the 2F 4.2Ltr making only just less at 1800rpm.

Length of stroke is the key to torque.

Can you get an adapter for the gear box to suit the Hemi conversion? Try calling Marks Adapters here in Melbourne they may know if one was or is available, most of theirs are to V8's I think though. Couple of guys have done the 4Ltr Flacon conversions I believe.

 

[serenity]

i havent seen an adapter available but i havent checked many places, if one isnt available i will build my own.

from the figures below you can see that the bore and stroke is smaller but peak torque is higher at the same rpm. compression ratio is higher as well, which should help with fuel econmy.

Bore Size: 3.76 in (95.5 mm)
Stroke: 3.68 in (93.5 mm)
Compression ratio: 9.5:1
Power: 165 hp (123 kW) @ 4600 rpm
Torque: 235 ft·lbf (318 Nm) @ 1800 rpm
Intake valve head diameter: 1.845 in (46.9 mm)
Exhaust: 1.500 in (38.1 mm)

 

[Hobbs]

You can see here the effect going to the 4ltr 3FE had on torque, the shorter stroke moved peak torque to 3000rpm over the 2F 4.2Ltr making only just less at 1800rpm.

Length of stroke is the key to torque.

Can you get an adapter for the gear box to suit the Hemi conversion? Try calling Marks Adapters here in Melbourne they may know if one was or is available, most of theirs are to V8's I think though. Couple of guys have done the 4Ltr Flacon conversions I believe.

I agree with mcinnes. Long stroke promotes torque. Although, I would be interested in seeing torque bands across the RPM range.

There are other factors which affect torque such as cam profile, connecting rod length, intake/exhaust manifold design, ect...

 

[serenity]

what sort of manifolds would you be running? at the moment i have a set of 6 to 2 headers to bolt on, what changes would you make to an intake manifold to produce more torque? also i havent got any experience with cams, what would you be doing with the cam timing? i dont want to end up with a lumpy idle. the length of the stroke should be an easy fix, hotrod hemis are rather popular over here so finding a kit wont be hard.

 

[FJ40Jim]

What about the toyota 1FZ 4.5Litre hemi 6cyl? Wouldn't it be an easier fit into the truck, since it's available in 70 series, which aren't much different from 40 series? They are rated 200 to 250 hp, depending on year
& market.

 

[serenity]

does a 40 need a larger displacement engine? my reason for a hemi 6 was their availabilty and reliability, also 245's are slightly smaller than a 2F while producing more power and torque. i just cant think of another reliable and common engine in australia with the power of a hemi, another factor is also the simplicity since im not a fan of computers. got any suggestions of smaller displacement reliable engines that could be swapped into a 40?

 

[serenity]

i finally have a photo of the vehicle, i havent determined the year but it appears to be an early model, its 4 speed with drum brakes on the front. the seat is cool, has hight and base tilt adjustments and is really comfy and supportive so its the new drivers seat in my 60. does the firewall section of body separate from the tub or is it a single piece? i thought they were 2 pieces but they seem to be welded together. this thing has some weird mods such as twin shocks on the rear.

 

[diso]

Castlemaine rod shop (crs) dose a toyota to hemi kit.

 

[Jetboy]

is the 5vz-fe available? That's 190hp 220 ft/lbs and very reliable in my experience. Don't know the torque curve shape, but the one in my 4runner is great on fuel and pulls around the heavier vehicle just fine. They aren't terribly expensive around here either.

 

[serenity]

yo diso is that for the 4 speed cos if it is then that would make my day, i know the shop your talkin about.

 

[diso]

Dont know about 4 speed but ive seen 265 in a 74.

 

[serenity]

thanks diso, get paid on wednesday so i will go buy the hemi i have lined up for the build, gotta finish the bodywork on my 60 so i can haul parts around, should get into the rebuild in the next few weeks.

 

[uted]

i finally have a photo of the vehicle, i havent determined the year but it appears to be an early model

Going off what i can see in the pic, i would say it's early or pre 1969