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Old 09-19-2008, 11:19 PM
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Default DIY zen mods??

I have just spent the last hour searching for a thread on a illustrated step by step on how to mod a zen can any one help with that at all? I would like to mod my own motor
Old 09-19-2008, 11:47 PM
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Default RE: DIY zen mods??

some good links and info here... http://www.rcuniverse.com/forum/m_7962719/tm.htm

sikk and zen mods are pretty much the same
Old 09-20-2008, 12:00 AM
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Default RE: DIY zen mods??

OLD...SLOW
AND IN THE WAY
Thanks for the reply that is just the kind of thread I'm after if only i could read dutch! [:@]
cheers craig
Old 09-20-2008, 02:36 AM
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Default RE: DIY zen mods??

Here you go mate best how to there is.
Mart
[link]http://www.modelgasboats.com/Magazine_Content/Tech_Articles/Engine_Porting.html[/link]
Old 09-20-2008, 03:37 AM
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Default RE: DIY zen mods??

Thanks mart

I have just pulled motor from our fun run at redcliffe this afternoon so I guess i'll start with die grinder tomorrow

cheers craig
Old 09-21-2008, 03:23 AM
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Default RE: DIY zen mods??

Make sure you post your results.
Old 09-21-2008, 07:54 AM
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Default RE: DIY zen mods??

http://www.jrcbd.com/showthread.php?...zenoah+porting
Old 09-26-2008, 06:31 AM
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Default RE: DIY zen mods??

After completly stripping and inspectig motor in my view the weakest link in the internal driveline would be the rod does anyone have any input on the strength of a stock rod or is there something i can do to improve it ie. machine a lighter but stonger alloy rod, or would that be a waste of time ?
Old 09-26-2008, 06:54 AM
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Default RE: DIY zen mods??

The rods are fine Craig, you gonna have that thing put back together for this Sunday ?

Cheers, Danny.
Old 09-26-2008, 07:24 AM
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Default RE: DIY zen mods??

This sunday will be out for me my wife due for third kid so boats on dry dock for a while
Old 09-26-2008, 08:11 AM
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Default RE: DIY zen mods??

Third she'll be fine get the boat wet .
Mart
Old 09-26-2008, 08:57 AM
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Default RE: DIY zen mods??

One of the cheapest hop-ups is adding zero-drag seals. They're around $15.00 and will add 200-500 more RPM.
Old 09-26-2008, 09:07 AM
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Default RE: DIY zen mods??

Ron, drag seals for what?

Ryan
Old 09-26-2008, 09:23 AM
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Default RE: DIY zen mods??

They go in by the crankshaft bearings to reduce the drag of the rubber seals.
Here's some from Zac's site about 2/3's of the way down to give you an idea of what they look like: http://www.americanrcboats.com/produ...gineacczen.htm
Most engine modders carry these, I just had his site handy.
Old 09-26-2008, 10:22 AM
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Default RE: DIY zen mods??

Thanks Ron, I was thinking of something else.

Ryan
Old 09-26-2008, 03:40 PM
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Default RE: DIY zen mods??

Third she'll be fine get the boat wet
I thought about it but she might get upset when I tell her to catch a cab in because I'm busy running boats
That would be castration with a blunt kitchen knife
One of the cheapest hop-ups is adding zero-drag seals
Thanks ron I was thinking of adding them but wasn't sure if they made a huge difference
Old 09-26-2008, 05:07 PM
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Default RE: DIY zen mods??

Like Danny said, Rods are fine. Reduce piston weight and smooth the airflow. Get a degree-wheel to do your intake and exhaust timing and your all set. 260's have rather small transfers, open them up smoothly and you will notice the most gain.
Old 09-26-2008, 11:57 PM
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Default RE: DIY zen mods??


ORIGINAL: martno1fan

Here you go mate best how to there is.
Mart
[link]http://www.modelgasboats.com/Magazine_Content/Tech_Articles/Engine_Porting.html[/link]

Follow what you can of this "How Too" ...... Your power. RPM will be substantially improved
Old 09-27-2008, 12:48 AM
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Default RE: DIY zen mods??

craig i will let you drive the WHITE DEATH on sunday if your too slack to finish the mod ,can i book in for the kitchen snip too lol
Old 09-27-2008, 12:59 AM
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Default RE: DIY zen mods??

hey im packed and ready to run
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Old 09-29-2008, 03:21 AM
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Default RE: DIY zen mods??

Well I have finally found the time to do some work to my zen after the kids, the wife and the car oh and a little bit of work
I read the links that everyone had posted and there was some very helpfull info in them so I put them to practice ( keep in mind I am a amateur at this, a virgin so to speak so go easy on me)
Here is a few pics of my first attemp at mods
it's only rough cut and nothing has been cleaned up yet
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Old 09-29-2008, 05:08 AM
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Default RE: DIY zen mods??


ORIGINAL: munro1656

Well I have finally found the time to do some work to my zen after the kids, the wife and the car oh and a little bit of work
I read the links that everyone had posted and there was some very helpfull info in them so I put them to practice ( keep in mind I am a amateur at this, a virgin so to speak so go easy on me)
Here is a few pics of my first attemp at mods
it's only rough cut and nothing has been cleaned up yet

It looks like you have everything you need there to proceed, what exhaust and intake timings are you going to aim for? Also, don't forget, as someone touched on, when your engine is done, it will produce power at much higher revs, so, unless you can reduce the inertial loading on the con rod and crankpin you are risking failure, your piston will need to be lightened for reliability.

I will be interested to see how this works out for you.

Glenn
Old 09-29-2008, 05:16 AM
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Default RE: DIY zen mods??

Thanks glenn the next step after match porting crankcase to jug was to machine internals of piston to lighten, I had read somewhere that you machine top of piston?? in my thought that wouldn'd that reduce compression?
cheers craig
Old 09-29-2008, 06:52 AM
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Old 09-29-2008, 12:35 PM
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Default RE: DIY zen mods??


ORIGINAL: munro1656

Thanks glenn the next step after match porting crankcase to jug was to machine internals of piston to lighten, I had read somewhere that you machine top of piston?? in my thought that wouldn'd that reduce compression?
cheers craig

Larry has posted a picture of a piston done the way he used to mod them, as you can see, far from stock.

The turning down you refer to is done by some on the diameter of the piston to give some relief in the cylinder when running, so will not affect compression.

What timing are you going to aim for on your completed motor Craig?

Glenn


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