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ChadS
02-16-2004 14:23:10
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Re: Re: Re: How do I squeeze a little more power?? in reply to Farmall Daddy, 02-16-2004 11:08:17
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Farmall Daddy, there are so many things to do to the 88, to hop it up, it is not funny!! From what I have learned recently, is that the 88 head is a very restricted cyl head. It does have very small ports, and a small intake manifold. I would estimate, that you would have around 450-650 in the head to port, polish, and big valve it. Would be easier to find a head that has a better flow and bigger intake. From what I have also learned,,, when porting, polishing, and big valves, is that it can rob you of power if it does not compliment the rest of the engine. What I mean is, even though you give it more air, and fuel, you may drop too much vacuum, and lose torque. This is where you would need to increase compression to compensate for the change in the engine. You can mill the head,, to help, but may not be enough. I would start by dyno tuning it for peak power. Most make a mistake when dyno tuning, by just setting the timing, and the carb main fuel adjustment, and saying, yep, it is all it is going to get. That is not true at all. A stock, unaltered carb is hiding power. It simply will not deliver enough fuel to make power below 540 rpm, and that is where you need to look for power for a puller. it is called torque. Every time I get into dyno tuning a tractor, I will peak it with what it has, and then say, lets do more. I go through the carb, open up the fuel jet, and the metering stem, Like I am sure you have seen my posts in the pulling forum, the main jet size will need to be increased, and the bottom 2 holes in the brass metering stem will need to be drilled to match the main jet. That will give it fuel. Now, that is about all you can do with the small carb from the 88. Now, a good fuel, (not racing fuel) will be helpful in making power after the carb has been modified. Ok, lets look at the ignition, the mechanical advance is holding it back as well, all you have to do, is go to the parts store, get a Chevy distributor curve kit. it has 3 sets of small springs in this kit, use the lightest spring in the kit to replace the stiff, stock springs. This will advance the timing a lot faster, and will increase throttle response. Also, get a electronic ignition, or a MSD. That condensor, is robbing current to the plugs, you can either go with the electronic conversion, or buy a MSD unit, and still use points. either way, you get rid of that condensor, and will double the coil output to the plugs. I used a MSD, and points on my 460H, and eliminated the condensor, and gave it more spark. I was able to increase the fuel to it, because it is able to burn more fuel ,and not foul them out. Ok lets look at cyl heads,, you asked about porting and polishing, and milling, I can make you a thinner copper head gasket that will boost more compression, just by installing it, you can mill it and use the gasket, and pick up a few more ponies that way too, on porting, just clean up the intake ports, and you can open up the exhuast ports as much as you want., the intakes, just need to be clean, and unrestricted, only when you have alot of compression, will you need to open up the intake ports size, you will lose vacuum. so just clean em up, and polish the intakes, and open up the exhaust all you want. I would say,, by matching the carb to the engines potential, changing the advance springs, you will see about a 7-12 hp increase easy!! You want more? change fuels, good for more yet, still not happy? mill the head, and get a thin gasket, with all of the above, you could see about 20 more Hp easily!!! If you are from Indiana, I am about 40 miles west of Ft.Wayne, IN on 114, you can bring it down, and I will set it up for you on the dyno. email me if you need any more info, Hope this helps. ChadS
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