- Sun Jun 27, 2021 2:37 pm
#97322
So, TEC bike parts now offer a performance Camshaft for the Himi.
https://www.youtube.com/watch?v=GHoqvbAnvEo
Promising 4 extra horses(20%) for £200
No retuning requried.
I'm a skeptic, but I'm taking a punt on this one, Here is my logic.
A 400 should be able to make 40bhp. For example, CB400X @ 45bhp.
The Himi is a long stroke, so it can't rev as high.
It's a low compression engine to deal with 70-80 octane fuel.
And it's a thumper.
But still that shouldn't add up to 21 lost horses.
All the Dynos I have seen show that exhausts, filters and even ECUs have a minimal impact on power production.
So the usual performance suspects seems over specced for the actual performance we get, and "upgrading" them does nothing
This makes me think it was designed to be better and then held back, most likely for emmissions.
Low compression, Longstroke engines are known for slow incomplete burns. This makes me think unburnt Hydrocarbons.
PAIR systems help with those at low RPM, not high, where peak power is produced.
Cats do nothing.
You can only lean a mixture so much before Aluminium starts melting.
The only way I can think the engineers could improve hydrocarbon output, is to remove any valve overlap and delay the opening of the exhaust valve. Which would reduce performance in high flow situations.
That is a huge amount of supposition on my part.
Anyway, money where my mouth is, I'll give it a go. If it feels like I need to drop a tooth after on the motorway I'll mark it a win.
https://www.youtube.com/watch?v=GHoqvbAnvEo
Promising 4 extra horses(20%) for £200
No retuning requried.
I'm a skeptic, but I'm taking a punt on this one, Here is my logic.
A 400 should be able to make 40bhp. For example, CB400X @ 45bhp.
The Himi is a long stroke, so it can't rev as high.
It's a low compression engine to deal with 70-80 octane fuel.
And it's a thumper.
But still that shouldn't add up to 21 lost horses.
All the Dynos I have seen show that exhausts, filters and even ECUs have a minimal impact on power production.
So the usual performance suspects seems over specced for the actual performance we get, and "upgrading" them does nothing
This makes me think it was designed to be better and then held back, most likely for emmissions.
Low compression, Longstroke engines are known for slow incomplete burns. This makes me think unburnt Hydrocarbons.
PAIR systems help with those at low RPM, not high, where peak power is produced.
Cats do nothing.
You can only lean a mixture so much before Aluminium starts melting.
The only way I can think the engineers could improve hydrocarbon output, is to remove any valve overlap and delay the opening of the exhaust valve. Which would reduce performance in high flow situations.
That is a huge amount of supposition on my part.
Anyway, money where my mouth is, I'll give it a go. If it feels like I need to drop a tooth after on the motorway I'll mark it a win.