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panibadboy said:
2mins is the time of fast group of a regular track-day



I just gave you 2 brands, 3 different bike types - what fan boys post are you talking about ?
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I care way less about what time you run in the fast group at a track day than I care about if you are comfortable with and keep your cool in close passing, and hold a predictable steady line, and are past having panic reactions if things go wrong…I ride in the fast group, and I’m slower than 80 to 90% of the riders in that group…but I meet all those criteria above so nobody ever has an issue with me riding with them. I try to avoid the slower groups, not because they are slower, but because they are more dangerous at track days.
 
Steven31371 said:
I care way less about what time you run in the fast group at a track day than I care about if you are comfortable with and keep your cool in close passing, and hold a predictable steady line, and are past having panic reactions if things go wrong…I ride in the fast group, and I’m slower than 80 to 90% of the riders in that group…but I meet all those criteria above so nobody ever has an issue with me riding with them. I try to avoid the slower groups, not because they are slower, but because they are more dangerous at track days.
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all makes sense.

I'm just curious what drives you buying hp4 race over gen4 s1000rr ? $$$ ?
 
panibadboy said:
all makes sense.

I'm just curious what drives you buying hp4 race over gen4 s1000rr ? $$$ ?
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Weight, chassis, suspension and brake components, and most importantly of all, those gen 4 engines are failing and BMW is not standing behind the warranty with honor and integrity. Also I’m in love with my RC 8C chassis and ergonomics, I want my next liter bike to be as close to this RC 8C as possible but with more power next season. The HP4 Race weight, sizes, ergos, etc are the closest thing out there to the RC 8C. Price is not that relevant to me.
 
I bought 2 hp4 race, one to ride the other as spares, i can honestly say that it is the best motorcycle i have ever ridden, it just does everything you want a motorcycle to do, i ride it at 90% of what i would my race bike and that's about 1sec slower but ultra safe. In Australia parts are no longer available but engine parts are. Engine is very easy to rebuild and will do 5,000 race KLM no problem. Engine has close ratio gearbox made by alpha but could also fit the Nova one that is even better, has mild camshafts and few other kit parts but can definitely be rebuilt easily. At 146kg there is nothing else like it.
 
Bruce Wayne said:
I bought 2 hp4 race, one to ride the other as spares, i can honestly say that it is the best motorcycle i have ever ridden, it just does everything you want a motorcycle to do, i ride it at 90% of what i would my race bike and that's about 1sec slower but ultra safe. In Australia parts are no longer available but engine parts are. Engine is very easy to rebuild and will do 5,000 race KLM no problem. Engine has close ratio gearbox made by alpha but could also fit the Nova one that is even better, has mild camshafts and few other kit parts but can definitely be rebuilt easily. At 146kg there is nothing else like it.
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Source for engine parts?

Do you know any reputable engine builders who have rebuilt, and are accepting work rebuilding, the hp4 race motors in the US? I’ve looked and can’t find anyone.
 
craig bush said:
Source for engine parts?

Do you know any reputable engine builders who have rebuilt, and are accepting work rebuilding, the hp4 race motors in the US? I’ve looked and can’t find anyone.
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Most parts are OEM, im in Australia so don't know anyone in the US, but i would think that any reputable engine builder could rebuild one they are a really easy engine to work on.
 
craig bush said:
Source for engine parts?

Do you know any reputable engine builders who have rebuilt, and are accepting work rebuilding, the hp4 race motors in the US? I’ve looked and can’t find
Click to expand...


There’s no special sauce in that edge, it’s got a titanium crank and some titanium bits in the top end to handle higher RPM, but it’s essentially sort of normal run of the mill endurance racing parts

With Ducati’s, the entire bike is built around the engine, the entire chassis of the bike is set up around managing that engine. HP for race is like the KTMRC8C. It’s chassis first engine second.

Which is precisely why they’re so damn good to ride at track, especially if you’re not a professional
 
Steven31371 said:
There’s no special sauce in that edge, it’s got a titanium crank and some titanium bits in the top end to handle higher RPM, but it’s essentially sort of normal run of the mill endurance racing parts

With Ducati’s, the entire bike is built around the engine, the entire chassis of the bike is set up around managing that engine. HP for race is like the KTMRC8C. It’s chassis first engine second.

Which is precisely why they’re so damn good to ride at track, especially if you’re not a professional
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Iirc it uses titanium rods. I don’t know of any engine with a titanium crank.

Folks keep saying there are people capable of rebuilding these motors, but no one seems able to name anyone. As with many things - lots of talk. lol
 
craig bush said:
Iirc it uses titanium rods. I don’t know of any engine with a titanium crank.

Folks keep saying there are people capable of rebuilding these motors, but no one seems able to name anyone. As with many things - lots of talk. lol
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I found a place but haven’t told you so you don’t run and buy that HP4 Race in Houston ahead of me that’s $39k 😂😂😂
 
craig bush said:
Iirc it uses titanium rods. I don’t know of any engine with a titanium crank.

Folks keep saying there are people capable of rebuilding these motors, but no one seems able to name anyone. As with many things - lots of talk. lol
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There is a racing team that has a shop in South Carolina called KWS that builds/re-builds the engines. I’m pretty sure Attack Performance can too but will call them to find out ;-)
 
Steven31371 said:
There is a racing team that has a shop in South Carolina called KWS that builds/re-builds the engines. I’m pretty sure Attack Performance can too but will call them to find out ;-)
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Called KWS and talked to the owner, Kevin - personable and hugely helpful. Confirmed they’ve built a couple of the hp4 race motors. Estimated $10-15k depending on what needs to be done. Seems like a really cool dude and great option for bmw motor builds.

Asked if he’s built any pv4 motors and unfortunately, they don’t really work on Ducatis.
 
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Bruce Wayne said:
At 146kg there is nothing else like it.
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Apparently that’s the dry weight. 171kg fully fuelled from what I found on the interweb. V4R with the Akrapvovic is apparently 179kg wet without fuel, and that’s with the stock fairings and sound deadening, etc. It’s a significant difference in weight of course and it’s definitely a cool bike.
 
spooky said:
Apparently that’s the dry weight. 171kg fully fuelled from what I found on the interweb. V4R with the Akrapvovic is apparently 179kg wet without fuel, and that’s with the stock fairings and sound deadening, etc. It’s a significant difference in weight of course and it’s definitely a cool bike.
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For apples to apples comparison with full gas tank the V4 with a lot of weight reduction is still about 35 to 40 pounds heavier.
 
spooky said:
Yes, it’s a significant difference, I just wanted to clarify the earlier 146kg comment - dry weights don’t really mean all that much.
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I prefer to measure in dry weight as it's a more accurate measurement IMO. Especially for a race bike, most instances the tank is never full when on track, some tanks are different volume so the wet weight can be all over the place, dry weight is the true weight of the motorcycle and can't be manipulate.
 

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