making and squeezing more power out

[NooP]

I have "heard" of modifications that can be done to engines to get more power out of them. I have mainly heard of crank and port work that can be done. Anyone know where I can read and learn more about this? Is it a good idea?

--NooP

 

[SlingItX]

NooP-

This isn't specifically about 'how to port', but it's worth the read:
Understand Engine Porting and Timing

Everything I've heard about engine modding (including port work) is it takes years of experience and some pretty intense knowledge of how an engine works and understanding the full impact of the mod on the engine's function. There are a few hacks trying to make a name for themselves by offering port work (seen a few on eBay) that really have no idea what they're doing, and essentially learning the trade on other peoples engines.

I suppose it's a good idea if you're going to have a reputable modder do the work. And I wouldn't bother having mods done on an engine that's not designed to be a race engine - in other words, why dump $150 of mods into a $120 engine. Now if it were a Rody modified... I suspect it's worth every penny.

 

[newnitrofan]

Hmm, Just because I have a dremel I have thought of doing porting work. Truth is I don't have the expereince to do it. I need to learn how to tune my engines apparently. Ok newayz slingitX has actually given you good advice. Porting work is very tricky from what I understand. You absolutely have to know what you are doing. There are some things you can do outside of the engine to help. Not much but some things.

 

[NooP]

like what?

--NooP

 

[El Pirata]

Originally posted by newnitrofan
Hmm, Just because I have a dremel I have thought of doing porting work. Truth is I don't have the expereince to do it. I need to learn how to tune my engines apparently. Ok newayz slingitX has actually given you good advice. Porting work is very tricky from what I understand. You absolutely have to know what you are doing. There are some things you can do outside of the engine to help. Not much but some things.

With your dremel???? OMFG!

 

[newnitrofan]

Originally posted by El Pirata
With your dremel???? OMFG!

Hey El there are lots of guys that have thought about doing it with there dremel and the right attachment. In some cases RCCA recommends it. Article 1 porting exhaust header , article2 , article 3 look at the dremel attachments required.
Now I am not recommending these at all. Just noting that there are things you can do with a dremel and the right attachment that people with expereince. Again no recommendations coming out of me on this.

 

[NooP]

Those articles are really informative. Do you have any that cover os cv .15 engines?

--NooP

 

[El Pirata]

Originally posted by newnitrofan


Hey El there are lots of guys that have thought about doing it with there dremel and the right attachment. In some cases RCCA recommends it. Article 1 porting exhaust header , article2 , article 3 look at the dremel attachments required.
Now I am not recommending these at all. Just noting that there are things you can do with a dremel and the right attachment that people with expereince. Again no recommendations coming out of me on this.

Maybe my hands shake too much but I would not port my engine with a dremel. I'd rather have my machinist buddy do it in his mill.

 

[Flamez]

yeah this really helps:

 

[GilBeQuick]

I ported my Pro .15 with the Dremel. Dremels kick ass, you can use them for everything. I followed the same link up above. I'll tell ya what, if you're looking to get more power out of your Pro .15 and you've got a steady hand, do yourself a favor and go for it! The porting and streamlining really wakes that engine up. Crap, the hardest thing about it was removing the bearings from the case.

 

[Robie6]

ok so this thread is old but here goes------you can buy or make your own degree wheel. Don't be scared of the word "degree", if ya can count to 360 your in. I made mine from 2 180 degree protractors, mounted a aluminum back plate & I was off. Read up on timing of a 2-cycle engine, then read yours & make a chart showing open & close times, duration, overlap. Its amazing just how simple it is. That doesn't mean you'll be a pro anytime soon but now you'll know more than the people who say "leave it to the pro's, or its some kind of secret club you have to join. Steve said there are only 5-6 people in the world he'd trust with he's engines & thats kewl. But as soon as he said that I said to myself "ok, lets find out where the magic is. There's nothing like having exp. & "years of know how" but these 5-6 guy's had to start somewhere-right?. Maybe they were lucky to have someone teach em or went out on there own & started from scratch. Probably blew up more than a few engines along the way but with the knowlage on the web these days by guy's who are willing to share (you can tell right away from the dummies) the only reason someone doesn't explore this topic is because there "scared" plain & simple. Some may say "I don't want to blow up my engine" & thats ok! Don't try it cause you have no self confidence in yourself anyway. Keep going around driving "box engines" & try not to scare yourself to much. This time 1 year ago I didn't know silch about these engines, but I found tons of reliable info. out there & dug in. So far I've done 3 of my own engines, the 1st just a mild polish on the crank & opened the carb some, still runs. 2nd engine I did some minor port work & flowed the crank, opened the carb.---still runs great. 3rd engine was a .26 I got with my Dirt Demon. I matched the sleeve & case, flowed the ports some & opened the crank hole a tad, flowed the crank opening into the case, opened the closing side of the induction port to 60 degrees ATDC, read up on balancing, bought a gram scale & balanced it to 50%. Was I scared to start it???? hell yes!!! I'd rather been behind a wall instead next to it but guess what--started 1st blip. Did some break in on the bench Dam thing wouldn't get over 230F. Now its in the DD & starts & runs super great, lotta torq & fast, temps around 240F. Do I think I'm some sort of wizard?? noooo, just wasn't scared to try as it seems most people here are. Trust me guy's & guy-ets the magic's in the air all ya gotta do is download it & quit making excuses for youself. Sorry bout the spelling, I was in a black out most of the 60s, don't remember to much-lol