Bonneville America Forums Forums Technical Forums Performance Mods Performance Camshafts coming soon!

This may sound stupid so bear with me. If the limit is 10k and the 270 engine will no longer have this problem of cutting out even w/o the limiter as you say Graeme, does this mean it will not be a wasted spark ignition? And if so, wouldn't this mean another sensor would need to be installed? If so, would that be something a non-mechanic but otherwise mechanically minded person could do?

Treading into dangerous waters here with my lack of knowledge, but we don't have a wasted spark ignition like the regular Bonnevilles do. It's why we have 2 coils and they only have one.

Well thats why i said this may be a stupid question. someone recently suggested the wasted spark ignition was responsible for the cut out of the 270 engine, so i thought it was. I didn't realize that 2 coils meant no wasted spark. But then what exactly IS the reason for the 270 cut out? Anyone know?

Probably cuts out for a couple of reasons;

1)Nothing to be gained in power for revving beyond 8,000 rpms

2)Cast pistons and rods aren't designed to handle much more than 8,000 rpms.

FWIW, Jojje, that mad turbo Swede , concurs about point #2. Well, close to that anyway. For stock Bonnevilles, I believe he's adjusting rev limiters to something like 8400 rpm. Since those bikes have a stock limit of 7400 rpm, that's a substantial gain. With the Speedmasters having a 7,900 rpm rev limit, there's little to be gained by a 500 rpm increase.

Now if you're talking Wiseco big bore with forged pistons, and maybe some Carillo rods, then the talked about 9,000 rpm rev limiter could be doable. I wonder what RCV thinks about this cast piston/rod durability with his in-the-works higher rev limiter?

I know Jojje also has said that he can't really make the 270 motors have a higher rev limit, but I'm not sure why he said that is. Maybe a search over at Triumphrat.net will give the answer. I seem to recall a post that said when the 270 gets into the high rpms, it could have a problem maintaining it's consistant firing sequence, but I could be wrong.

boys and our toys...you wanna cruise, buy a triumph-(BA or SM) then if you wanna go fast- trust me, go and buy an R1 like me. (pics in my album). all this heads, cam, big bore etc etc lot of money for too few horse power. just my .02 cents. cheers

amen greybeard

Frank

Yep. Once and for all i'd like to see this question go away forever ! "if you want speed, get XXXX". Well, they never consider the possibility that every bike every person has ever bought is ALWAYS imperfect in some way or another. Does this mean he should sell it for another? What good will that do when NO BIKE IS PERFECT. He'd just be going from one imperfect bike to another. Point is, i love my bike more than any speed triple or other such contaptions and i would love it if i had to leave it stock. But heres the big suprise.....YOU DON"Y HAVE TO LEAVE IT STOCK !! So why not tailor the bike as close to your idea of perfect as possible? There is no reason not to, and there lies the answer to this constantly asked and rather senseless statement.

If I can add to that last sentiment. I love by TBA, honestly I do. Handles great, it's comfy, and fits me like a glove. My ONLY issue with the bike at this point is power. Not sportbike power, but torque maybe is the better word. Passing on a steep incline can be touch and go, God forbid I'm two-up. If I can add a performance cam, for $1,000 or so, and it bumps me 20 horses, that's a better investment than selling mine and buying a new Sport Bike.

Right now the only thing getting me off my TBA would be a TBA 1200 or something.

If you ever been in love with the sound of a small block chevy putting out a 1000 hp and screaming for blood then you dont even have to ask why would you want too. You almost have to do it. Its a sin not to squeeze every horse you can out of what ever you have. I think it may even be on the list of the seven deadly sins.....One question... RCV..Why make it work with a throttle position sensor. Most of the after market carbs dont have this feature....

Personally, I prefer the sound of a 5000 HP big block MoPar. But, as for bikes, some people have more cash than they know what to do with. Those ones go out and toss away $50K and up to get whatever bike is "trendy" that week.
The rest of us go find a bike (or car/truck for that matter) that has the look we like and solid mechanicals at a price we can afford. After that, it's a small change here, a bigger one there, some bolt-on power, some elbowgrease power, etc. Maybe, My Triumph might eventually cost me as much as a Superduper Wonder Dog shop built custom, but it won't cost me that much all at once. It will fit me perfectly and, because I know the bike intimately inside and out, it is much less likely that I will make a fool of myself trying to do the impossible on it.

By the way, the TPS is probably used because it is a lot simpler than working out the air flow with a MAP sensor, especially when constant vacuum carbs are used.