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Show Parts for Model:

!! Wanted !! More HP

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Daryl Bard

07-09-2002 11:35:11

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I saw some where an old advertisment of a high compression head that was offered for the N series motors.Does any one know where I can get one of these or can my head be worked to get the same results? How about domed pistons? Raising the 6:1 ratio would add a few more ponnies. Thanks

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Chuck A.

07-09-2002 16:07:36

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 Re: !! Wanted !! More HP in reply to Daryl Bard, 07-09-2002 11:35:11  
A old timer told me that they used take the sleeves right out and use Mercury pistons.

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wa'll . . . . .

07-09-2002 17:54:27

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 Re: Re: !! Wanted !! More HP in reply to Chuck A., 07-09-2002 16:07:36  
thar ain't no substitute for cubic inches except cubic money, how FAST ya' wannna go?

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Dell (WA)

07-09-2002 15:58:10

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 Re: !! Wanted !! More HP in reply to Daryl Bard, 07-09-2002 11:35:11  
Daryl...........flathead engines loose too much cylinder head volume due to necessity of being able to open the flathead valves to really effectively raise engine compression much higher thant 6.5:1.

But if you are really wanting to experiment, try riggin' up a big block Chevy smog pump as a vane driven suppercharger to charge your 120 cu/in flathead. You would have to pressure seal the carb innna big airtight box to get the jets to work right or else suck the carb thru the smogpump and then into the manifold.

Read some hotrod books about supercharging, NOT turbo charging altho that could work if you're really into engineering, welding and machineshop work. Used smogpumps are cheap..........Dell

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07-10-2002 00:08:56

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 Re: Re: !! Wanted !! More HP in reply to Dell (WA), 07-09-2002 15:58:10  
I doubt that the volume of air a smog pump would move could keep up with the airflow needs of an N, unless you really turned it FAST, but it might be fun to see. They really don't move that high a volume of air.

On the other hand, several models of cars over the last 10 years have had engines that were upgraded in power by adding small superchargers that I think operate on much the same principles as a smog pump. Maybe one of those would be a better starting place than a smog pump.

There would be some problems to overcome. I doubt that gravity feed of the fuel would work too well and figuring out a workable pressure box would take some time. I also would worry about octane in available gas--just say no to detonation...

Have you ever considered a tiny turbo with the carb mounted so the turbo sucks through the carb rather than pressurizes it? That would eliminate some of the problems above. Or would the exhaust restriction and additional mixture add too much heat to the flathead configuration?

Or maybe it would just be good to enjoy a good running tractor at its designed horsepower. There are lots of tractors with more horsepower that a person could buy if you really need the power.

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Dell (WA)

07-10-2002 00:52:13

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 Re: Re: Re: !! Wanted !! More HP in reply to Hal/WA, 07-10-2002 00:08:56 this buggs me, I copied this from the www net somewhere and didn't save the url. I'm gonna try and type some of the pertent parts, al'fresco.

Dirt Cheap Steven A Richmond

"ok her it is. pleases don't laugh until you've tried this. it really works.We've used this thing for many differnent jobs where we needed a lot of volume of air at low to moderate pressure levels and the almost always work out very well.

All you need is a smog pump. People don't realize just how efficient these little pumps are. At 8000 rpm you can feel a strong air blast from a one inch pipe attached to one of standing over 25 ft away. They will actually produce up to 60# or more and if you block the airflow completely, the pump will stop a 5 hp electric motor.

Most of them take in air through an impeller right behind the drive pulley, which is fine for most purposes, but some are equipped with a separate inlet port complete with a small air filtering device, which can prove useful in certain cirmcumstances. There are piles of them in junkyards which you can actually get for as little as $5.

Some of these pumps have more capacity than others I like to play with the ones for 350 Chevy police cars or 454 bigblock trucks. The only thing that will ruin these pumps is heat. 90% of pump body is aluminum, so they are relitive light.

Be careful how much intake pressure you apply to a high compression engine, keep it under 8 psi on a 9:1 comp engine.

We attached one of these to a friends son's go-cart engine (B&S) and the power increase was very impressive. One should suffice for most motorcycle engines........end quote

Like I said, big smogpump on our low compression, slow turning 120 cu/in engine could be an interesting adventure...........Dell

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07-10-2002 16:33:01

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 Re: Re: Re: Re: !! Wanted !! More HP in reply to Dell (WA), 07-10-2002 00:52:13  
OK, maybe. If you turned it pretty fast by using a real small pulley on the smog pump. My experience has been with pumps on engines we were fooling with, and with the standard pulleys, there was not much volume when we took off the output plumbing. I would be concerned about heat buildup turning a pump fast. The heat transferred to the air would increase chances of detonation problems. And I would really worry about smog pump durability at high RPM's. The ones I have seen don't have any oil connections to circulate cooling oil like most real superchargers. And don't they have plastic vanes?

Before I spent a lot of money and time fabricating a pressure box and other stuff needed to make one work, I would do a test on long term durability of a smog pump at high speeds.

But you are right, it might be fun. And at least the smog pump itself would be a cheap start to the project. I can see big expenditures to make it all work right. OK on a play toy, I would not try it on something I was really going to use to do work.

I have mused about adding a very small turbocharger to my 641Diesel to up the power some. A friend of mine has a track hoe with a smaller diesel than my Ford, but with one of the smallest turbos I have ever seen. It has serious power and the hoe will do amazing things. It seems easier to get a turbo to work right on a diesel than a gas engine.

Now I have something else to think about. What do you think about using a smog pump to pressurize the air intake of a small diesel?

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07-09-2002 12:31:07

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 Re: !! Wanted !! More HP in reply to Daryl Bard, 07-09-2002 11:35:11  
The Sherman Brothers of transmission fame made a high compression head but very few remain.

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Evil Steve

07-09-2002 11:54:51

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 Re: !! Wanted !! More HP in reply to Daryl Bard, 07-09-2002 11:35:11  
Never heard of a high compression head for an N.

IF, and I mean big IF, you could find a hemi-type piston that would actually fit in an N head without blowing the head right off, realize that you are reducing the volume of fuel/air mixture in the cylinder which would leave you with less detonation, thereby REDUCING hp.

Only viable way I can think of (and it's expensive) is to put in cast iron sleeves, bore them out a few thousand, and have your pistons resized (or manufactured new) but with 3 tight fitting compression rings (actually you may be able to buy 3-ring pistons anyway). That may raise your ratio a little, but you still have a low compression engine.

It's really not worth it.

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07-09-2002 11:45:07

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 Re: !! Wanted !! More HP in reply to Daryl Bard, 07-09-2002 11:35:11  
Scroll down to John Smith's post about a 3 point cement mixer. Take note of the engine in that N!

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07-09-2002 11:38:12

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 Re: !! Wanted !! More HP in reply to Daryl Bard, 07-09-2002 11:35:11  
Guess it goes over my head
Even if you could gain an extra measure of horses from the four banger, would the rest of the tractor be capable of handling it?
I think I would rather have a Flat head 8 :-)

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its the W O W factor . . . . .

07-09-2002 16:26:15

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 Re: Re: !! Wanted !! More HP in reply to rbell, 07-09-2002 11:38:12  
you know, chrome plated high compression lugnuts.........

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