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Thread: Simon 335.
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07-10-2020, 10:56 AM #15000 RPM
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Simon 335.
Anyone have a simon 335? Thoughts, performance vs a 300x? Anyone dropped in a 3.2 crank in one?
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07-10-2020, 01:45 PM #25000 RPM
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Isnt the 335 basically a stock promax with the 300x injector setup and a downdraft intake? If that is the case I am sure it is a nice improcment but still missing the porting and peak rpm of a 300X.
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07-10-2020, 03:07 PM #35000 RPM
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Well I was trying to hear from the horses mouth what exactly it is, but you cant pass the lady that answers the phone. What I have heard is that it is bored out to a 3.1, hydra tech tuner, ported, heads and the billet x intake and injectors. I read an article last night that states alot more. I will copy and paste it here.
With your donor engine, Simon completely disassembles the powerhead and measures it for replacement parts. He ports the cylinders to his specifications and completes any repair work (boring, sleeving and/or honing) that needs to be done. The engine is bored .030 inches oversize to achieve a 3.1L displacement (stock is 3.0L).
For reassembly, he uses lightened and balanced connecting rods, Vertex moly-coated pistons, a lightened and balanced flywheel, a specially flowed Simon high-volume intake manifold and reed cage assemblies, and a host of other ancillary performance parts such as a high-flow fuel rail, custom water diverter poppet valve, a cut exhaust tuner, and solid engine mounts (if not already equipped). He installs a set of high-compression (but still 91-octane-fuel safe) cylinder heads and a revamped electronic control unit with a race-derived fuel curve to handle the extra fuel requirements of the new powerhead.
I have one but have never run it. Just getting a little cabin fever and was wondering if there are as strong as they are supposed to be and durable. Guess there isnt alot more of them out there.
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07-10-2020, 05:00 PM #4
Stroker crank 3.2
You talking XS optimax ?We have invented the world; WE see
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07-10-2020, 05:37 PM #55000 RPM
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It is a promax...but I have heard a few guys putting a 3.2 stroker optimax crank in 300x motors with good results.
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07-10-2020, 07:18 PM #6
Piston leaves the block a bit with a 3.2 crank.
Back in my NHRA SFWD honda racing days we would use taller sleeves and a spacer between the block to improve rod stroke ratio. We made 800 whp back in 2003 on 4 cyls.Azure AZ259, 8.1
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07-13-2020, 04:47 PM #75000 RPM
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Is Simon Motorsports still in business? Tried to find their site but it's not available.
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07-13-2020, 06:17 PM #8
Huffman Motorsports builds them
Willow Valley AZ.
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07-13-2020, 06:33 PM #9
A good friend of mine put Simon heads and ECU on his 300x on his Mirage and got nothing from what I saw.
He was never satisfied with what he he got.I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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07-13-2020, 07:07 PM #10
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07-13-2020, 09:06 PM #115000 RPM
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Thought it would be an easy drop in....Think I a going to keep it how it is for now. Thanks for the responses guys.
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07-14-2020, 06:17 AM #12
I had a set of copper head gaskets made to compensate for the same issue in a custom project.
Can also mill the top of the pistons depending on the shape/complexity.I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.
I refuse to allow common sense to interfere w/my boat buying decisions.
Checkmate 16' 140 Johnson
Hydrostream 17' Vector FrankenRude I
Laser 480 (?) 21' w/GT 200
Glastron Carlson Conquest w/XP 2.6
Glastron Carlson CVX 20 w/XP 2.6
24' Sonic w/twin 250 Johnsons
24' Sonic w/twin 250 HO Johnsons
19' STV River Rocket w/FrankenRude II
Allison XR 2002 w/Frankenrude II
Hydrostream 18' V-King w/Frankenrude II
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07-14-2020, 10:21 AM #13
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07-14-2020, 10:27 AM #145000 RPM
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07-14-2020, 12:53 PM #15
My guess is Yes it is worth it! You can take that Promax, bolt on every trick piece Simon ever made or thought about making and I doubt it would come close to the horsepower of a 300x with a stroker crank. In my mind, it just seems like the Simon/Promax route takes way more effort and expense.
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