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 Kohler 7000 series engine build

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Mtdmudmower
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PostSubject: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeSun Feb 09, 2020 1:21 am

I'm going detail some of the 7000 series Kohler engine build ideas I have here starting off with cylinder head modification. For one the ports are fairly open requiring only some minor port work for optimum flow. Pics will be posted once I get a clear shot on the original heads. I've already modified the second set.


Last edited by Mtdmudmower on Sun Feb 09, 2020 6:59 pm; edited 1 time in total
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AllisKidD21
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeSun Feb 09, 2020 8:12 am

Cool! Looking forward to the pictures of this one. Is it a KT Series 1 or 2?

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"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
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Mtdmudmower
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeSun Feb 09, 2020 6:56 pm

I think I need to change the title of my post just a bit. So this is not a kt17 which is apparently the kt series. Also happens to be an opposed. This build is the newer kt735 model number which I realized is called a 7000 series despite it having kt in the model number. My bad.
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AllisKidD21
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeSun Feb 09, 2020 7:00 pm

Ah, so it's a V-twin then.

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"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
       - MTD Off-Road Build     
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prancstaman
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeSun Feb 09, 2020 7:10 pm

Cool, I love a good engine build.
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Mtdmudmower
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeSun Feb 09, 2020 7:17 pm

Yes it is a v-twin. Not even one of the bigger ones in that line of engines. Although it is fairly big at 725cc which is right about 44cubic inches. The way it's built leaves lots of room for really dragging the power out of it.
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AllisKidD21
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeSun Feb 09, 2020 9:59 pm

Sounds like it has potential to be a real powerhouse!

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
       - MTD Off-Road Build     
       - Toro Rat Rod Tractor Build
       - Ford LT 110 Off-Road Build
       - Craftsman GT 6000 Off-Road Build
       - John Deere 110 Basic Off-Road Build
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Mtdmudmower
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeMon Feb 10, 2020 7:07 pm

I'm hoping so. I've got new valve springs new rocker arms with a better ratio coming that aren't here yet. I'll detail it all as I start posting up the pics. I'm waiting on the rocker arms. So I can start tearing into it and show everyone what I've learned and how I figured it all out.
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Mtdmudmower
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeThu Feb 13, 2020 6:32 pm

So here's some stock engine specs. 735 cc or 44ci, 9.1:1 compression ratio. .343 intake lift at the valve and .307 exhaust lift at the valve. Stock rocker arm ratio is 1.5. so I figured I can cheat the factory cam with a 1.6 ratio rocker arm to get a little more lift and duration of the cam. No aftermarket cam exists yet for this block. Making a new can the way this camshaft is made wouldn't be impossible. I'll detail that in another post. So my initial thoughts have been better carb, better valvetrain, and some minor port work on the heads. What I have done so far is found a beehive valve spring that is a near drop in upgrade. It's .260in longer than the stock spring with a higher spring rate so I'm order for it to work I either need to make a .250in deep spring pocket or source a longer valve. Still researching a possible valve. Another upgrade I want to do is increase the pushrod diameter from 3/16 to 5/16 so I don't bend one. As far as the carb I got a 34mm flat slide I mocked up on the stock block. Better for here with no other changes will wake this engine up all by itself.Kohler 7000 series engine build Kimg0510
Kohler 7000 series engine build Kimg0512
Kohler 7000 series engine build Kimg0511
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prancstaman
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeThu Feb 13, 2020 8:04 pm

Would be easier to cut the springs to size with a cut off wheel and a jig to hold it. Be easier then redoing the valvetrain geometry or cutting the head up. Springs are definately stronger then stock.
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Mtdmudmower
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PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitimeThu Feb 13, 2020 10:29 pm

Cutting is not the best option here cause you loose the flat end and increase your spring rate. These will have 40lbs of seat pressure. Which is a lot more than the stock spring. I disassembled the stock ones rather easily by hand. As far as increasing the valve height is a simple fix to keep the geometry the same by just adjusting the pushrod the same length. It just moved all upward meaning if need to make a space for the valve cover. Which I will likely need to do any way with the new rockers.
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Kohler 7000 series engine build Empty
PostSubject: Re: Kohler 7000 series engine build   Kohler 7000 series engine build Icon_minitime

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