The Typhoon Build (Hopped Up F-Head)

got the head on, well sorta, I loosely assembled everything, debating on new head bolts or not.

The tool finally came in, putting the head together all but 15 minutes.

I did notice I put my freeze plugs in backwards....got to take them out and get new ones and put them in the right way.

Adjusting valves tomorrow, then bolting on everything else, which isn't much.

 

DONE! I special ordered a full copper head gasket so it took awhile to get that in.

According to some computer software I have been messing with, plugging in #s, I should get somewhere close to this:

96 HP @ 2950 RPM
158 Ft-lbs @ 1900 RPM

I say that is good enough, without messing with the ignition or fuel systems. I must have changed the power band when I modified the stroke? We shall see, calling my friend telling him I am ready to use his dyno sometime this week (see when it will be available)...till then, catch up on some homework.

 

I'm gonna go out on a limb here and say you're gonna be shocked at the results and lucky if you make 80hp out of this motor. I'm hoping for better but without ignition upgrades, a bigger carb and aftermarket cam 96hp is just out of the question.

Good Luck and keep us posted!!

 

Yeah I am figuring that is about 10 hp too high anyway. I was expecting a little lower actually, around 85, forgot to add drag earlier... on my orgional figures, the program add that. I got the upgrades ready and waiting in my shop, its just going to take some time to go through and do the tests.

 

I'd really be interested in seeing the results once there in, there are a lot of postings about getting more out of these engines but most power gains are guestimates. I see turbos for 1.8 l or similar size engines occasionally for $50 price range listed in Craigslist. How difficult would it be to set up something like that? Is it just a matter of plumbing the exhaust or are serious fuel mods required.

 

drag coefficient of the crank bearings, rod bearings, wrist pins, and cylinder walls. Of course their was no option for porting and polishing that might add some, also I was using a chevy 2.2 liter engine, DOHC engine, and modifying the parameters, de-tuning it a lot, the f-head wasn't an option at all to begin with. So things might be different. I also couldn't put in the 2 inch intake valves, only 1.60" and only allowed to run a 1.30" exhaust valve, appenently the combustion chamber is too small on those engines to run the 2 inch intake and 1.5 inch exhaust vales the f-head has.

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in regaurd to turbocharging:

yea you can stick a turbo on this engine and run ~6 psi boot all day. But, you must use one that uses the exhaust side, and run a carb box. tuning it using a bigger 2 barrel car is damn near impossable. you would have to run hotter plugs, and modity the oiling system a great deal. You also got to run a $60 full copper head gasket to keep from getting a blown head gasket everytime you rev it up.

long term plans is going TBI and running a turbo with ~4 psi, that will give max boost at ~2000 rpm.

 

I am thinking it is mostly because of the valves. I would guess the drag would be worth 5 hp or so.

 

You're discounting the poor flow of the exhaust valve/port arrangement of the F-head in your software program. Substituting a Chevy 2.2 isn't really applicable since the intake/exhaust port ratios are far superior to the F-head. Flow in, flow out. Can't have one without the other.

I bet you'll be pretty close to the gross ratings of the F-head as long as the dyno operator doesn't fudge the numbers (lower the water temp, etc).

Here's where we shoot closest to the pin. I'm gonna guess 81hp.

 

it was that or a honda 2.2.. whose heads are the best flowing in the world. I might have done some figure wrong, only a 8 hp increase from gaining a whole compression point isn't making sense here. With lower hp engines gains in hp are much easier to manage, and are much greater. percentage wise.

 

Best of luck and hope your calculations pan out but I remain dubious, recammed or not. And as was discussed on Jeepforum, I think the turbo is going to make for some funny shaped rods. Again, this is only a slightly modified Whippit motor even if it got Willys the MA/MB contract.

 

how ever for a 4 cylinder everyhing is so over engineereed compared to todays moder 4 cylinders. ever looked at a rod off a civic si? very light duty compared to this engine

 

confirmed! those who are saying such low gains are wrong.. i just got off the phone with severl ol time hot rodders and they all told me about the same thing

all 6 guys do not know each other too here is what they all said:

20 hp and toqure gain for the comp ratio gain of 1 point
5 hp and toqure gain for being at .060 os
10 ft-lb gain for the .040 stroke
porting is worth another 5

they said that is is normal figures for the early 4 cylinder dirt racers from the 50s that they had built

 

the dyno will tell...