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 Modded 35 vs efi 40 
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Post Modded 35 vs efi 40
I have read through most on here and still have a few questions. Right now i have a 35 with mikuni, heads decked .035, p&p with Manley valves, and a set of the old dual exhaust. I was somewhat pleased with it, although have had a few crank case issues and just recently burnt or cracked a piston running 87 octane. My fault but anyways....... right not i have it on a 1756, looking at a 2070 that only weighs 50# more.

My motor needs a rebuild, but im trying to decide which way to go, i really like the sound of a 40hp efi, but does it need valves replaced? Not that big of a deal just curious. Im realy thinking i want to turbocharge it, not ask for alot out of it, but just a little more than what the 40hp has to offer, ive seen too many issues with the alum rods so i realy want to keep the factory rotating assembly maybe gap the rings for boost clearance......

What makes the 40hp a 40hp over the 35s?
Also if i do go the turbo 40hp route. Who should i talk to about programming and dyno tuning it?

Thanks for the discussion


Fri Jan 18, 2019 7:17 am
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Post Re: Modded 35 vs efi 40
I have the 40efi, really great motor. Carry's a load with ease. Not a speed demon, but it's extremely consistent from my uses regardless of weight.

From what I know (limited) the new 40efi block is identical to the 35/36 block with some internal differences, and EFI obviously. They strengthened the block, higher compression and new pistons/connecting rods. There's also a different cam in the 40 block and I believe the stock muffler is more of a performance muffler than the old ones, but I can't comment on that, my motor came with a Q muffler from the dealer.


Fri Jan 18, 2019 8:45 am
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Post Re: Modded 35 vs efi 40
I went from a modded 37 to a stock 40. First thing I liked about it was how quite it was. I have been really
Impressed with the low end power from the 40. It isn’t as strong as my old modded motor but it is much stronger than a stock 37. Biggest reason for me changing was my son, he has taken an interest with hunting and I don’t like the fact he can’t hear me when he has his ear muffs on while running my old motor.


Sat Jan 19, 2019 7:52 pm
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Post Re: Modded 35 vs efi 40
Where do you find a 40 powerhead? I've looked and can't seem to find one

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Sun Jan 20, 2019 9:09 am
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Post Re: Modded 35 vs efi 40
a stage 2 35 will always be stronger than a stock 40 with most off the shelf parts.

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Mon Jan 21, 2019 6:10 am
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Post Re: Modded 35 vs efi 40
I wondered about this...

How does a sxs comparison of a 35 with heads, mikuni, and exhaust
Go against a new 40 efi with exhaust and K&N

Similar?

Big difference?



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Mon Jan 21, 2019 7:35 am
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Post Re: Modded 35 vs efi 40


Mon Jan 21, 2019 10:29 am
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Post Re: Modded 35 vs efi 40
It also has different compression.

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Mon Jan 21, 2019 10:50 am
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Post Re: Modded 35 vs efi 40


Mon Jan 21, 2019 12:12 pm
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Post Re: Modded 35 vs efi 40
For the most part same ports and Head CC. Cam profile is 285L 222D Intake 285L 232D Exhaust. The piston used the smaller dish piston like the 25-31 big blocks Unlike the 35 that uses deeper dish piston. It also has a better tune as in refined fuel trims and a better ignition timing curve. It bigger improvement is the exhaust is essentially what you guys refer too as a "gutted stock".

The piston/ rod is NOT compatible with a 37 due to the small end shape of the rod, and the Front crank journal is .080" long for a "thicker" block up front.

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Mon Jan 21, 2019 1:00 pm
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Post Re: Modded 35 vs efi 40
all I know is I gots a 3 year warranty on my 40. not so wif a grenade motor. lol


Mon Jan 21, 2019 7:36 pm
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Post Re: Modded 35 vs efi 40

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Tue Jan 22, 2019 8:02 am
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