Big power Little package...

[dr15144]

I'm just wandering if anyone has ever bored and basically stroked out like a 15 or 18 and just went with new sleeves and piston?..... just wondering ... dont see why it wouldnt work we do it to our small blocks on the street all the time...

 

[frickenjoey]

1:1 engines have rings to fill the gap that you bored out of the block. The nitro engines need the tight sleeve to make compression. Most of them do not have rings. If you honed one out you would loose all compression and ruin the engine. You have to get a new piston and sleeve it you want to rebuild. The post timing will not allow you to put an 18 sleeve in a 15 and vise versa. If you want an .18 buy one. However I am not going to tell you not to try it. We all a ruined stuff by "trying it" and have stories to tell about it.

 

[Suicide]

if i had a cnc machine id try to kinda fuse two cankcases together to make a v twin motor

 

[dr15144]

Hmmm now i like the idea of that Suicide , but ya was thinking that once it was bored out to where a sleeve from say a 21 would fit and still have that shorter stroke...... i would think that as long as the sleeve and piston fit it would work...? just my thinking anyways, also maybe trying to clean up the ports on it as well kind of bore the port and polish at same time..... and now that i found out that the last motor i bought from ebay is junk.... why not give it a try

 

[Suicide]

well if you a cnc mill. mill down two crank cases weld them together and mill an new crankshaft

 

[dr15144]

or you could also go a lil bit simpler way and base it off the harley engine. both cylinders hit at same time... would have a cool sound for sure

 

[Racer 1966]

or you could also go a lil bit simpler way and base it off the harley engine. both cylinders hit at same time... would have a cool sound for sure

I wasn't aware that both hit at the same time........never worked on a Harley.


Both of these idea have been in my head along time. Wish I had more spare time to try them out. Let me know how it works if you do.

 

[Suicide]

hey if i had the money to throw away and a machine shop. one would already be made

 

[Racer 1966]

or you could also go a lil bit simpler way and base it off the harley engine. both cylinders hit at same time... would have a cool sound for sure

After some thought I had to do some research.

YES, they use 1 coil for both clylinders so both plugs fire at the same time, but 1 cylinder is in the compression stroke the other is in the exhaust stroke. I was surprised to find out they are using a single throw crank for v- twin engine though.

There's your useless information for the day!

 

[dr15144]

hmmm see i dint actually know that they was both in dif strokes but i knew that it faired at the same time so i just assumed that they both hit at the same time...... and i knew that was what gave it the unique sound and rough idle, doesn't make since to ahve the coil fire both at same time espeicaly on the exhaust... oh well they got to know more then me cause they been around a hella of alot longer then me!!! just my .02 cents

 

[olds97_lss]

hmmm see i dint actually know that they was both in dif strokes but i knew that it faired at the same time so i just assumed that they both hit at the same time...... and i knew that was what gave it the unique sound and rough idle, doesn't make since to ahve the coil fire both at same time espeicaly on the exhaust... oh well they got to know more then me cause they been around a hella of alot longer then me!!! just my .02 cents

I don't know anything about harleys, but if they have both plugs fire twice as often, then it will fire when each piston comes up in the compression stroke.

 

[Racer 1966]

I don't know anything about harleys, but if they have both plugs fire twice as often, then it will fire when each piston comes up in the compression stroke.

:shrug: I gotta say you lost me with this one