I am starting a new thread Gas engine parts interchange. Some of the first postings may be cut from another thread. It would be good if we could kinda keep the postings to just mainly what parts will interchange form any small RC engine including power product engines like chains saws ect. This thread may take a long time to get all the data others may have... added to it. Thanks Capt,n<hr />
As Kweasel has pointed out - 2 of the engines that currently have the highest "top end power" (Actual useful torque to turn large props and make large amounts of thrust) are both "under square".

Captinjohn, it sure would be an interesting thread. So many engines have such similar dimensions, there is a plethora of useful parts around. some may require very minor mods to make them work well.

Badazzmax - I have recently used the exact same crank as you to replace an "early JC" one. Didn't try the cylinder change out but it sure makes a good idea for obtaining good quality parts for the future.
(Now I wonder what I could use to replace a 28cc crank - shoud I ever need to - might investigate that in the next week or so - not that I need to of course [img]{akamaiimageforum}/image/s4.gif[/img] ).

I wonder if it would also work with the old DL50 bits. I have a couple of very low run time of the "Version one" of those (the one with the weak crankcase lugs) I might have a bit of a play also - like you, I have a few spare crankcases laying around that are not useful for anything else.

Most modern day gasoline model engines can use the Rcexl type ignition as a replacement even if they did not come with it originally.

From Aussiesteve
Recently I have had cause to model a off the shelf 48mm cylinder with an off the shelf 35mm crank with the intent of using an "off the shelf" cylinder for an engine made from "off the shelf" parts for very respected engine guy who I consider to be a good friend of mine. Even though the cylinder porting was designed for a different stroke, the basic unit still worked very well for the model. It is just a matter of finding the right piston to suit the deck height involved (still working on that side of it).

The best part of this hobby? - ALL products suit someone in it, some of us like to wonder, others like to tinker, others like to get the simple instant gratifaction - we ALL have fun either way, so no matter what the Chinese throw at us (lets face it - right or Wrong, Deserved or not, They are our major suppliers) someone will enjoy the new products.
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From bad Max

Thanks for the reply Steve.

Then from what you say the old theory of shorter stroke is quicker off the line it true for two stroke engines also.

Did something today just for kicks

Got a little bored today so thought I would have some fun.

I have a lot of JC engines crank cases that I can not get cranks, piston and cylinders for but have a lot of parts for DLE.

So I took a crank piston and cylinder and installed it in one of the JC crank cases, All I had to do was shorten the crank bearing spacer about 1/2mm, move the sensor and drill out the cylinders for 5mm bolts and all went together good, Even the squash came out good and has good compression.

Kind of looks funny because the crank case is a little wider than the base of the cylinder.

Got to late for me to run it today but will give it a try in the next couple day&rsquo;s and see how it does.

From Capt,n

Now that is something I would really like to try. There are so many small engines made for RC &amp; for small power products. Seems like many different combos could be experimented with.Keep the data comming guys!

There is so much I could post here that it would take me weeks, I will try to do it a little at a time.

Did people know that reed blocks from DA DLA DLE and 3W will interchange.

A RCexl is a plug and play for the OS55 that the original OS ignition cost about $280 next to Rcexl cost from $60.00 to $70.00

BadAzzMax, Thanks for the reply. I think we are off to a good start here. I bet AV8TOR, Antiguecan post a lot of data here also.They aregood engine men. We go back a long time here enjoying &amp; trading ideas and engine part exchanges too. Capt,n PS. I know there are a lot of good engine men out there. In the AM...My mind is cloudy!

From BadAzzMaxx

Going to have to see how it runs before I get to excited about it. LOL

There are a lot of the china parts that will interchange with other engines.

One main part are the reed blocks, most of the are off the shelve parts.

Found out today working on a 3w

From <u><font color="#00265e" size="2">BadAzzMaxx</font></u> The DLE style crank rods are 2mm longer than the JC rod but the length of the DLE style cylinder is 2mm longer from the base to the squash point of the cylinder so it all worked out good.

From outside to outside case bearings, The JC is 1mm shorter so I had to take 1mm off the bearing spacer that goes on the crank between the case bearings, I think I posted 1/2mm but it was 1mm

Got the squash down to 1mm, Would have liked for it to have been about a 1/2mm but will see what kind of power I get out of it.

Just trying to find something to do with these JC engine crank cases I can not get parts for. LOL
m ......

Anybody know what this engine was converted from, most parts to convert is was off shelve parts.
Only thing I had to make for it was the hall sensor bracket.

Answer

http://www.davesmotors.com/s.nl/c.88...t.A/id.4415/.f
At one time they would sell you the short block but do not know if they still will do it.

Prop hub, prop shaft nut and carb adapter from a CRRC works on it.

Do you have a newer style 3W with a bad ignition, The RCexl is a plug and play replacement, No modifications needed.

CY 29 18x6 xoar 8400,same as zen 26rc 2 bolt.

returning to short stroke options. In a two stroke engine the short stroke has the advantage of MORE port area, so the same port time-area can be achieved with smaller port crank angles, leaving more time for the gasses to excert pressure on the piston. Apart from that, short stroke engines are smaller and lighter for the same displacement. There is no advantage whatsoever in long stroke ratios. Torque is a derivate from cubic inches, and shorter strokes in the same displacement have too many advantages, constructive as well.

Anyone got any data or chart on what exhaustheadersinterchange from Brand to Brand of engine &amp; or engine cc. Thanks Capt,n

what about the china made engines,like DLA,DLE.how close are these engines for interchangeable parts,like the crank,piston,cylinder all the parts that ware out.

I find all this fascinating. Here's what I can share regarding exhaust.

Near as I can tell, early RCGF 45, CRRC 45/50 w/side intake, Zenoah 45, TGY/Turnigy (HobbyKing) 52, all use variants of the same angled exhaust port cylinder, appear to share exhaust dimensions?

How many use the same as the CRRC 26 (34mm bolt hole spacing)? RCGF/Aerovate 26 very close w/32mm spacing, DLE 30, Zenoah 20/23/26?