Topic: Anyone on here run a really nasty cammed engine before?

[JLeather]

Just picked up a built 836 engine that has never been fired before.  Cracked the v/c off tonight and it's running an RC 327 cam.  The nastiest production cam RC made back in the day (specs at http://www.satanicmechanic.org/rccam.shtml).  It's supposedly got RC 836 pistons in it as well, but I haven't gotten into her that far yet.

Does anyone know what C/R the RC 836 kit used to run and if it was forged or not?  I wanna run this in a street bike, and I'd like to be able to ride it frequently.  How ill-mannered is this thing gonna be on the street?  Anyone actually ran a similar setup on here before?  I'm afraid this is gonna be a 1500+ rpm idle and a very jerky powerband.

[coyotecowboy]

As a rule, race cams SUCK in street vehicles.  But if it has a ton of compression, you may still need a pretty hot cam with enough overlap to bleed off a little compression and have it liveable.  The powerband will be very narrow and on the street you won't spend much time there.  And you probably won't be able to run it without some sort of octane booster or race gas.

Not speaking from experience with hot rod 750s but I've had some pretty wild small block Chevys (550 hp 400 ect..) and they're usually not much fun until you're showing those other clowns your taillights....



Then all is forgiven


Aw screw it, use that engine for what it was built for, KICKING ASS!!!

[low-side]

Don't think you will get away with stock carbs on it.  The boots for my 32mm carbs will show up in a couple of days and I'll tell you how it goes since my megacycle cam is about the same specs.  So far it seems very streetable with ignition advance and high octane gas.

[MRieck]

 Sparty and other folks have heavy cams. They can easily work. Those huge overlap cams can stink on the street but that's old school. 1,500rpm idle isn't bad really.....it's about what modern bikes idle at.

[JLeather]

The only non-stock carbs I've got at the moment are the 28.5mm Kawi Z1 carbs (not the smoothies) with the large drain screw.  Might not be enough, we'll see.

[Sporkfly]

I could potentially get you some 39mm Mikuni carbs. I'll ask the guy about them again and what he wants for them, they were off of a late 80s Suzuki I think and I'm sure they could be made to work. Let me know.

[JLeather]

Im fairly sure that 39mm is way big, even for the extremely ported head I might have to throw on this sucker.

[Sporkfly]

Well, realize that I could be wrong about the 39mm. I know he still has them, but I wasn't actually interested in them so I don't recall specifics. I'll have to ask him about them again and let you know what size they are.

Good luck with that beast, regardless!

[754]

I would love to try the 327..315 is fine with my setup on the street, infact has way better midrange than I could have imagined.. if you are running stock carbs it may be a bit much..

There is still 2 cams hotter than that from RC..

I may have a 315 to trade, wont know till I tear into my motor..

Ior, I may be interested in buying it..

RC kits came in 10.5 or 12.0, most were forged..

[Jerry Rxman Griffin aka MuthaF'er]

I'm running a Yoshimura Daytona in my 810 on the street. Very mild mannered idleing at +/- 800 rpms.

Like 754 says, there are some of US (me) that would be interested in that 327 if you wish to get rid of it.

[Terry in Australia]

I run a Megacycle 125-75 cam in my 836cc engine with Mike Rieck's stage 3 head, RC pistons on RC rods, (thanks to Hondaman) Keihin 29mm CR's (Mike again) etc, with no drama's on the street.

It's got about as much torque as my stock CB750K0's engine, but accelerates much faster after 5000 RPM of course, and I've seen 120 MPH @ 11,000 RPM in third gear.

Yeah, I know, they don't make any more power after 9000, but I couldn't shift as fast as it accelerates, ha ha! Have fun!

[JLeather]

This is great stuff guys.  Thanks.  Now, I'm pretty sure the rods in this thing are stock (and I dunno if I can afford a good set at the moment).  Assuming it's running the 10.5:1 RC's and not the 12's, does a cam like this make it any more likely that I'll destroy a rod?  I'm definitely gonna drop on one of my ported heads.  I've got one that's off an old drag motor with larger valves, and I've got one from Ricky Racer that I think MRieck did a few years ago.  A bit more mild.

[MRieck]

Im fairly sure that 39mm is way big, even for the extremely ported head I might have to throw on this sucker.

I agree.....39 is to large. I run FCR 39's on my FJ1200 (now a 1314)

[JLeather]

Anyone know if the CycleX carb setup would feed an engine like this, or am I asking to mess something up by not being able to tune each cylinder.

[sparty]

I run a Megacycle 125-75 cam in my 836cc engine with Mike Rieck's stage 3 head, RC pistons on RC rods, (thanks to Hondaman) Keihin 29mm CR's (Mike again) etc, with no drama's on the street.

It's got about as much torque as my stock CB750K0's engine, but accelerates much faster after 5000 RPM of course, and I've seen 120 MPH @ 11,000 RPM in third gear.

Yeah, I know, they don't make any more power after 9000, but I couldn't shift as fast as it accelerates, ha ha! Have fun!

I love my 125-75 cam!  Wouldn't trade it for anything else.  Terry... 11,000 RPM!!!! Geez.  I spin mine to 10,500 and it scares me to death.

Sparty

[Terry in Australia]

Hey if you want to get really scared Art, try installing your engine in a bike with 2 inch over front forks, lowered rear and pullback handlebars. It's like trying to do chin-ups at 120 MPH as the wind tries to tear you off the back, ha ha!

I must finish off my racer project, I only installed this engine in my K1 for the break in............... 

[MRieck]

Hey if you want to get really scared Art, try installing your engine in a bike with 2 inch over front forks, lowered rear and pullback handlebars. It's like trying to do chin-ups at 120 MPH as the wind tries to tear you off the back, ha ha!

I must finish off my racer project, I only installed this engine in my K1 for the break in............... 

I'd imagine the racer bike would screw. It certainly has the head to do so.

[Terry in Australia]

Ha ha, well yeah Mike, the head is great, but (thanks mainly to you, Hondaman and Sean) the rest of that engine's no slouch either, ha ha!

[HondaMan]

Just picked up a built 836 engine that has never been fired before.  Cracked the v/c off tonight and it's running an RC 327 cam.  The nastiest production cam RC made back in the day (specs at http://www.satanicmechanic.org/rccam.shtml).  It's supposedly got RC 836 pistons in it as well, but I haven't gotten into her that far yet.

Does anyone know what C/R the RC 836 kit used to run and if it was forged or not?  I wanna run this in a street bike, and I'd like to be able to ride it frequently.  How ill-mannered is this thing gonna be on the street?  Anyone actually ran a similar setup on here before?  I'm afraid this is gonna be a 1500+ rpm idle and a very jerky powerband.

You mean like, having to push it away from the stopsign, man, then gotta hold onto the apehangers and lean forward or the front won't stay down...nope, never rode one like that...