Aftermarket Performance 2F Cams

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Aftermarket 2F cam

This all sounds good. How much would changing to a RV cam affect the gas mileage. I currently have a 2F with a Weber 38DGAS, HEI ignition, and a MAF tuned header. The performance has improved but the highway mileage has dropped from 10MPG to 8-6.5MPG. I am hoping that getting the right jets in the carb will give me a happy medium. Would adding a RV cam further lower my mileage. Thanks
 
Dredging up an old but good thread......

Does anyone know what valve lift the stock cams produce? I've seen the timing info (ala post 64) but don't believe I've ever come across lift info....... or maybe we can piece it together from lobe measurements and the rocker arm ratio?
 
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mep1811 said:
This all sounds good. How much would changing to a RV cam affect the gas mileage. I currently have a 2F with a Weber 38DGAS, HEI ignition, and a MAF tuned header. The performance has improved but the highway mileage has dropped from 10MPG to 8-6.5MPG. I am hoping that getting the right jets in the carb will give me a happy medium. Would adding a RV cam further lower my mileage. Thanks
Click to expand...

I think it may actually improve your mileage by making the engine more efficient.

In general terms a high lift short duration Cam is good for torquey response, I think the difference between the various grinds of the "torque or RV" cams would be hard to notice "seat of the pants"

Getting the jetting right will probably help but make sure you've got your intake/exhaust/cam/ and even air cleaner sorted out first then jet the carb to match
 
any updates or conclusion to this mess?

I am about to get a rebuild done on 84 FJ60....all stock and original...dealer maintained.

So what was consensus DOWNEY or MAF cams.....with or without stronger springs....with stock or upgrade to electronic ignition???
 
Brock said:
I am about to get a rebuild done on 84 FJ60....all stock and original...dealer maintained.

So what was consensus..... with stock or upgrade to electronic ignition???
Click to expand...

The stock FJ60 should already have the good electronic ignition system. :cool:
 
:P just thinking of anything I could change out.....so looks like maybe the Downey RV grind cam, port and polish heads, slight overboring and decking, some headers that flow better....and be done with it. The carb has already been rebuilt and works great...alll hoses and belts are new already.

Now to find a H55 tranny to add to the equation....thanks.
 
Brock said:
any updates or conclusion to this mess?

I am about to get a rebuild done on 84 FJ60....all stock and original...dealer maintained.

So what was consensus DOWNEY or MAF cams.....with or without stronger springs....with stock or upgrade to electronic ignition???
Click to expand...

Brock - I'm running the Downey Torquer cams without stronger springs. I haven't been able to run my 2F enough since dropping it back in to tell anything - especially now that JimC has my carb and dizzy. I'll let you know in about a month when I get the carb and dizzy back and run the fool out of the motor.
 
Brock said:
:P just thinking of anything I could change out.....so looks like maybe the Downey RV grind cam, port and polish heads, slight overboring and decking, some headers that flow better....and be done with it. The carb has already been rebuilt and works great...alll hoses and belts are new already.

Now to find a H55 tranny to add to the equation....thanks.
Click to expand...

Just remember that a RV grind will give you good low rpm torque but at higher RPM (above 4000 rpms) it will hit a brick wall.
 
Mark W said:
That's just Downey making a few extra bucks. The factory valve springs will work fine to above 5000. I've run them to 6000. Few people will be pushing a 2F that high.


Mark...
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Mark, if you can use stock Toyoya springs with a high lift Cam (and they can keep up with the Cam), good for you. The more important point is that the stock springs coil bind at .440". Since our cam lifts .440", we thought springs that don't coil bind until .570" might be the safest thing to use.
 
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FJ40fiji said:
I ran a Downey Cam and header on a 22re in a 4 runner. They didn't really seem to do much for it. If I get another 22re truck, I won't get the same stuff for it again.
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Then atleast get a grind that will work with your computor's operating window. I know they are not as impressive as the carbureted engine cams, but such is life when something other than you is in charge of your engine!!!
 
Downey said:
Mark, if you can use stock Toyoya springs with a high lift Cam (and they can keep up with the Cam), good for you. The more important point is that the stock springs coil bind at .440". Since our cam lifts .440", we thought springs that don't coil bind until .570" might be the safest thing to use.
Click to expand...



Your numbers do not match my experience... I have... and continue to... run cams with .442 lift and stock springs in over a dozen engines. And I have sold the same cams to at least as many others who have done the same.

No bind, no float and no problems.


Mark...
 
Reviving an 8 year old thread.

What has changed with the 'generally accepted' cam recommendations? This old thread has widely differing opinions from some of the early oracles.

Most of the 2FE threads have trailed off without finishing or reporting results. Rock Doc's, Pappy's, and Tonkota's builds all finished successfully and I've studied all of them. My sense of what's happening in the 60's forum is that Mudders have given up on enhancing the 2F and are installing SBC's. Perhaps the 40's forum is still showing more loyalty to obsolescence?

My intent is to build a mostly off road 2FE into a high mileage 62; and, since I'll be forced to buy some new parts anyway, to gain what torque can be gained without illusions of high performance.

Any advice or recent cam reports would be appreciated. Thanks.
 
FWIW I have another 2FE that has made it a bit past the point of test firing. It's closer to a "stock" build with the original cam and internals and comparitively light headwork. It's sitting in a FJ55 with a SM420, but the way work goes for me it could be anywhere from 3 to 30 months before I get the damn thing finished and on the road. I'm also planning to put a H55F behind my first 2FE when it gets swapped to a fresher 62, but that will be even further off.
 
delta KC 289 into my 2F made it a bit of a monster...I have considered swapping in a reground stock profile to see what it takes away...Aslo considered adding the E to the 2F...We'll see which way I go...(2FE with delta RV grind)
 
LAMBCRUSHER said:
delta KC 289 into my 2F made it a bit of a monster...I have considered swapping in a reground stock profile to see what it takes away...Aslo considered adding the E to the 2F...We'll see which way I go...(2FE with delta RV grind)
Click to expand...

Thanks, RockDoc and LAMBCRUSHER. Tonkota also liked the KC 289. What does the 'RV' mean? Is it just a part number or a concept behind the specs? With engine internals, I'm still a bit of a noob.

So the reports of inadequate OEM exhaust springs have been debunked? I can have the 3FE head rebuilt to OEM spec and only change the cam?

Thanks again.
 
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