Has anyone turboed, port and polish or bored out their RC?

Power gains for turbo?
Port/polish?
Bored?

Thanks!

The cylinders are a composite ceramic, so if you bore them, you'll need to have them replated by companies that specialize in that, such as Millenium Technologies.

You can have the heads ported. Hord Power can do this.

Don't have any info on turbo'ing RC51's.

Turbo power gains I don't know but you can you tube it and there are a couple out there.

Port/Polish will get you 5-10 hp from the dyno sheets I've seen. Hord is excellent when it comes to this.

Bore I couldn't tell you. Haven't heard of anyone doing that.

The cylinders are a composite ceramic, so if you bore them, you'll need to have them replated by companies that specialize in that, such as Millenium Technologies.

You can have the heads ported. Hord Power can do this.

Don't have any info on turbo'ing RC51's.

Sorry,but factory manual say`s the RC has two oversizes 0,010 and0,020 inch.How you can rebore ceramic coat.

I wouldn't worry about port and polish if you're going to turbo. Is there power to be made if you do? Of course it'll have a LITTLE more power, but the cost isn't worth the benefit as the RC51 heads flow fantastic in the first place (Plus I doubt the difference in spool will be notable if you properly size the turbo). Same thing goes with increasing your cylinder size, it will yield you a little more power and a little better spool but not enough to where I'd go out of the way to do it. I've already turboed plenty of applications and the good setups are always the simple ones.

exactly what aircooled said.. p/p or using oversized pistons arent cost effective and overkill if your planning a turbo application..

Search youtube... there are a few vids from a guy who turboed his RC51. Maybe you can hit him up for some advice, and his results.

Sorry,but factory manual say`s the RC has two oversizes 0,010 and0,020 inch.How you can rebore ceramic coat.

i own a 1200cc rc51 engine, with 180HP, i havenīt made it myself, got it from japan

i own a 1200cc rc51 engine, with 180HP, i havenīt made it myself, got it from japan

I'm going to have to ask if you can provide a little more info on this.

I'm going to have to ask if you can provide a little more info on this.


what more info do you need?? i think thats all you need to know, especially when thinking of your previusly posts:mad:, i think thatīs all the info i want to share with you, i just wanted to point out that a big bore is possible

cheers

IV

i have removed my post due to the fuckers, having too much freetime on their hands, and donīt know a thing about bikes, just wanting a war on words, but canīt cope with reality

what more info do you need?? i think thats all you need to know, especially when thinking of your previusly posts:mad:, i think thatīs all the info i want to share with you, i just wanted to point out that a big bore is possible

cheers

IV

But i pointed that the cylinders are made cast iron, not ceramic coated.

But i pointed that the cylinders are made cast iron, not ceramic coated.

hi franz

the disscussion is not directed at you!!1 by no means, you are quite rigth, the debate is towards some of the users on this forum that just want to pick a figth to cover their own ignorance and cover up the fact that they donīt know what they are talking about


cheers

IV

so your upset because someone pointed out that a big bore setup might not be cost effective to a regular guy in his garage? Thats basically what was said. Your challenging peoples intellect when it seems like all you can do is read. You said yourself you didnt build the motor you just read a dyno.. How much do you think Morawaki dumped into that thing not just in parts but in R and D? As a guy that has used forced induction on cars I can tell you I can get alot more power out of my RC than that with a junkyard turbo setup.. But IMHO its got plenty of power with a few bolt ons.. Aircooled had an opinion and based on some of his other threads I can see he actually does own a set of wrenches so why dont you just relax tough guy..

so your upset because someone pointed out that a big bore setup might not be cost effective to a regular guy in his garage? Thats basically what was said. Your challenging peoples intellect when it seems like all you can do is read. You said yourself you didnt build the motor you just read a dyno.. How much do you think Morawaki dumped into that thing not just in parts but in R and D? As a guy that has used forced induction on cars I can tell you I can get alot more power out of my RC than that with a junkyard turbo setup.. But IMHO its got plenty of power with a few bolt ons.. Aircooled had an opinion and based on some of his other threads I can see he actually does own a set of wrenches so why dont you just relax tough guy..

if itīs my you refers to, then i must assume that you are retarded, because thats not the issue here, i got angry becayse two well know atagonists try to be the forum police, and call the shots here, i merely pointed out THAT A BIG BORE CAN BE DONE, itīs NOT impossible, than i got attacked, please get someone who can read to read the posts out loud to you, and explain the difficult words BEFORE you type some crap you without any references to what been said before...ok..dickcheese?

:mad::mad::mad::mad::mad:

your soooo angry... were you picked on at school??? Or are you 12?

BTW spell check your posts before you insult people it makes you look either dumb or unbalanced Im suspecting both..

I wouldn't worry about port and polish if you're going to turbo. Is there power to be made if you do? Of course it'll have a LITTLE more power, but the cost isn't worth the benefit as the RC51 heads flow fantastic in the first place (Plus I doubt the difference in spool will be notable if you properly size the turbo). Same thing goes with increasing your cylinder size, it will yield you a little more power and a little better spool but not enough to where I'd go out of the way to do it. I've already turboed plenty of applications and the good setups are always the simple ones.


and lastly I can read just fine.. he says here that in his opinion its not worth the cost for what turns out to be a small gain.. I must agree since Im not made of money..

Peace man!

And back on topic...........

I am kinda curious as to the potential gains of using a turbo application on the RC51.

I would assume that a reasonably small hot side would need to be used to reduce lag, and similarly a smallish compressor if using standard high comp pistons.

Can you retain standard compression pistons (maybe using a decompression plate?) or are low comp pistons a must have?

Then there is the question of mapping for fuel and ignition timing, I would hazard a guess that a Power Commander may not be up to the job, but I could be wrong :-)

And back on topic...........

I am kinda curious as to the potential gains of using a turbo application on the RC51.

I would assume that a reasonably small hot side would need to be used to reduce lag, and similarly a smallish compressor if using standard high comp pistons.

Can you retain standard compression pistons (maybe using a decompression plate?) or are low comp pistons a must have?

Then there is the question of mapping for fuel and ignition timing, I would hazard a guess that a Power Commander may not be up to the job, but I could be wrong :-)

a decompression plate should do the trick, the low comp. pistons is a overkill (itīs only my personal opinion, not hard fact:confused:)

and i also do beleive that a PCIIIR would work just fine, with professional setup?

I can actually agree.. Alot of people over think a turbo application... For a street turbo application all you need to think of is lowering the compression a bit and play with the timing. If your going to run low boost..ie 6-10psi thats all you really need to do. Now if you wanna get all crazy ad run high boost then yes Id go with Forged pistons with a lower compression and a fuel management system.. but IMO that would take away from the fun part of an RC.. It would be hard to enjoy a 220+whp RC in the twisties..

. but IMO that would take away from the fun part of an RC.. It would be hard to enjoy a 220+whp RC in the twisties..

exactly!!!!!!

exactly!!!!!!

Lol! Was just outta curiosity guys, a theoretical technical discussion :)

I just have a great interest in boosted applications, having previously been very much into modifying my Subaru Impreza (389Bhp & 404FT/Lb torque at 2.2Bar)

However, IF I was ever tempted to turbo/supercharge the bike, then a low blow system would be the way ahead.........wouldnt really want to experience 1Bar+ boost coming on song in the middle of a sweeping bend :eek:

I wonder if I still have that Nitrous Express kit still knocking about in the garage........;)

It seems like most of the focus has been on turbo aplications in this thread. Does anybody have any more info on the big bore idea? I am very curious about this. I don't have any money to do it, but it seems like a great idea. From what I gathered from the thread, the cylinders are ceramic coated, so not all shops could recoat them, correct? Also, one reply talked about a 1200 cc engine, is this the only option or are there 1100 cc kits as well? What kind of gains can you expect, torque and HP? Any idea on costs? Also, I saw in another post something about deposit buildup on a bored motor if its not running in the high rpm range, is this true? Would there be any significant maintenance/reliability with a slightly over bored motor? Would the valves need to be replaced? how about cams? Thanks in advance for any info. I am quite curious about this.

It seems like most of the focus has been on turbo aplications in this thread. Does anybody have any more info on the big bore idea? I am very curious about this. I don't have any money to do it, but it seems like a great idea. From what I gathered from the thread, the cylinders are ceramic coated, so not all shops could recoat them, correct? Also, one reply talked about a 1200 cc engine, is this the only option or are there 1100 cc kits as well? What kind of gains can you expect, torque and HP? Any idea on costs? Also, I saw in another post something about deposit buildup on a bored motor if its not running in the high rpm range, is this true? Would there be any significant maintenance/reliability with a slightly over bored motor? Would the valves need to be replaced? how about cams? Thanks in advance for any info. I am quite curious about this.

Kainzinger in Germany not only mods up stock engines, he also has two project bikes with larger sizes.
One is an 1120 with stock stroke and 106mm bore that develops 170 HP and 90 ft/lbs of torque.
The other is a 1315cc engine with 106mm bore and 74.6mm stroke that develops 190 HP and 106 ft/lbs of torque.
Both of these engines are not even streetable as they have 13:1 compression.
The 1315cc engine can't even be turned over by a 12v system and uses a 24v system. They both rev to 11.5K RPM.
However his streetable RC51 bikes make around 150 HP.
I have no idea how much it would cost. I would say a lot!!

Thanks Sub, as always you seem to be the man with the info. I think I will continue my quest to add lightness rather than power.

what more info do you need?? i think thats all you need to know, especially when thinking of your previusly posts:mad:, i think thatīs all the info i want to share with you, i just wanted to point out that a big bore is possible

cheers

IV

Haha!
I have something really cool, but you can't see it.
I'm taking my ball and going home.

Haha!
I have something really cool, but you can't see it.
I'm taking my ball and going home.

thats good! Well i have a 2400cc RC dipped in ceramic that makes 1000HP but i built it in my basement and cant get it out!lol that would be a joke:)

Haha!
I have something really cool, but you can't see it.
I'm taking my ball and going home.

Snerk...
So, you got it to stop blowing oil I take it....

I have a spare crank and cases. I might just think about a stroker motor...
I wonder how anyone would do a decompressor plate for a turbo when the cyls are integeral with the upper case....

As there was a recent chicken fight thread starting elsewhere I'd take the 1120 is the highest possible overbore one can do.
speedzilla: /rc51-technical-discussion/65107-999cc-1198-4cc-rc51-stroker-kit-2.html

That gives 105.9mm or 2.95mm scraped of the bore and head dome.
The question I have is how well does an engine behave at 106x63.6 ?
I'd rather have an engine with 100x70 dimensions giving 1100, which in this case it would take a ton of money to do, if possible.

To me it makes no sense going through that expense when you can pick an 1198 up for a quarter of the money, unless you are about to cheat club racers for an under the table bet.

Kainzinger in Germany not only mods up stock engines, he also has two project bikes with larger sizes.
One is an 1120 with stock stroke and 106mm bore that develops 170 HP and 90 ft/lbs of torque.
The other is a 1315cc engine with 106mm bore and 74.6mm stroke that develops 190 HP and 106 ft/lbs of torque.
Both of these engines are not even streetable as they have 13:1 compression.
The 1315cc engine can't even be turned over by a 12v system and uses a 24v system. They both rev to 11.5K RPM.
However his streetable RC51 bikes make around 150 HP.
I have no idea how much it would cost. I would say a lot!!