JB COMP

Heres some pictures of my last engine I did last night and today, this is my 3rd sleeve, 2nd try at the SPI, and 2nd crank. lmk what you think.

faisalbasha

i think it looks sick...im doing my picco .28 right now i tried it half way and there is a difference.. but not soo much

JB COMP

I'm looking for some cheap used enignes, that have under 3 gallons on them to mod, so for all I have done is 3-4 port engines, I have my 5-port 21 I'm gona try, but I'm really looking for a used axial 28 and try modding that.

faisalbasha

can you explaint to me how to modify the crank shafT???

faisalbasha

how do you modify the button??

JB COMP

on some engines you can't do this, because of what they did at the factory, but you basically make cuts that will help mix the fuel/air and to help discharge the fuel/air better. the cut on the left side (when looking at the crank face) that is to help mix the F/A (fuel/air) and the cuts on the middle of the crank face is to help mix/discharge the F/A.

I'm not good at explainning stuff, so thats why I would not make a good teacher. but SAVAGEJIM, lsurber, and hpi apollo really helped me with the knowledge, and supertib also helped me out. so those guys and readding this thread is where I got all my info from.

thats about the best I can do on explaining it.

EDIT: on the button, its really not (well IMO) its not worth doing because you're cutting down your compression ratio. I can't wait to try out the SPI port and see how it will run.

faisalbasha

i heard you are one of the moding experts on this thread and so i was directed to you by some1 to ask you or use a little bit of your experience to help me or help explain to me how to modd my picco .28 crankshaft....

can i get your help????

faisalbasha

did it make a difference after you modded your axial?????

faisalbasha

did it make a difference after you modded your axial?????

SAVAGEJIM

I do not know what a pircco .28 crank looks like, can you post a pic? from that, I can get an idea as to what mods could help it.

For the crank measurements, rea this thread and measure it up. thsn post the dimensions. I can help you figure out to increase the indution timng.

http://www.rcuniverse.com/forum/m_5995115/tm.htm

faisalbasha

how about i just make the whole a little bigger.... btw i am doing my axial crank shaft at the moment.......any advice...????

muggy breaker

ok so what is the easyest tool to use for porting the p&s im have a new one for my sts 30 and im going to do it myself and i want it to have as much power as possible and still be reliable and last for at least 6 gallons. the current p&s is one abmods did and its a stage 2 mod and i want more power but dont want to spend the money to send it to someone?

JB COMP

Adam (ABmods) dose a great job, and I don't think your going to get more power from one you did yourself than the one he did, or less you really really know what you're doing, and you have to know what port timing, guide ports, flow channels for full power.

I really don't see how anyone could want more power, the STS 30 stock is fast and then a modded stage 2 ABmoded one has got to be realy fast. if you don't know port timing then you would probaby be better off get Adam to do the stage 3 mod on it.

proptop

My Feedback: (8)

I just did one of my STS .30's and there really isn't much you can or need to do...the sleeve is so thin that IMO any guide channels etc. would be so shallow as to be of little effect...and you risk doing more harm than good.

When you remove material from a certain area, that changes the way the sleeve expands and contracts when the temperatures change...so there is an increased chance of distortion...and my point is, that the STS .30's sleeve being so thin, it wouldn't take much material removal to make it dangerously thin and prone to distorting and causing a power loss rather than a gain.

The above statement is conjecture on my part...but it's based on facts that I have read about on other engines.


All I did was radius the lower lip of the ports...de-burr the inner edges with a polishing point, and make sure there was no "swarf".

JB COMP

if the 30 sleeve is thin then, the 28 3-port wust be realy thin.

SManMTB

It's thicker.

supertib

the STS 30 sleeve is actualy thicker then the STS 28.......who says the 28 is thicker then the 20 ??????

SManMTB

Really!? Aren't the stroke of the .28 and .30 the same?

supertib

they machined the 30 case out further then the 28...stroke is 16.8 mm on both

SManMTB

OK that makes sense.

JB COMP

thats what I like about the STS is that the 28 and 30 have a 16.8mm stroke, so they rev higher.

supertib

a Picco P7 EVO 2 has a much nicer built crank then a STS, and it fits right in...... look for a P7 EVO 2/STS 30 hybrid project soon....

muggy breaker

so you really think if i want the most power send it to ab mods and have him do a stage 3 i still think i could do it myself if i mess up it is what it is i know that so explain how i would would do it i want to have the most power possible. just tell me let me worry about whether its faster or not better or worse.

SAVAGEJIM

I agree here, Picco is using high grade production techniques on the crank. The thing that I really like about it is the pressed in pin: this allows the crank face to be hardened and the pin to remain soft so that it is not shorn off from being too brittle.

Other run of the mill engines do not have such a feature; only the higher doller engines use this technique. This goes to show taht you will definitely get the a god return fo this engine, even if it might cost more.

muggy breaker

so no one is going to tell me the steps on modding a motor thanks?