rb 22

[skoota2]

who out ther running a rb 22 with avanit head!!! and how much cooler do ther run.please,and who selling them,price

[jonashford]

30 to 40 degrees c lower Af Rayspeed sell them

[sydduckett]

who out ther running a rb 22 with avanit head!!! and how much cooler do ther run.please,and who selling them,price

this May or not help. I have an RB20 with an Avanti head and it does appear to be running cooler. think I may have to go to a B7 as it's very rich downstairs. The head is the only change to the kit well apart from new piston and crank and it was running fine before. pretty unrideable with the b9

[Darrell Taylor]

been doing the avanti head/cowl on rb22 and 25 for a few years now in both centre and side plug forms and see around a 40f change in temp ,these i cut to suit from blanks with specific squish clearance,velocity and compression ratios to suit specific motors/port durations as well as further mods to the casting to aid cooling further ,if long stroke i use a cowling packer too

[drunkmunkey6969]

been doing the avanti head/cowl on rb22 and 25 for a few years now in both centre and side plug forms and see around a 40f change in temp ,these i cut to suit from blanks with specific squish clearance,velocity and compression ratios to suit specific motors/port durations as well as further mods to the casting to aid cooling further ,if long stroke i use a cowling packer too

I think that is a good testimony to these heads, that Darrell uses them on his fan-cooled Grp6 race bike (amongst other machines) and if they can handle that heat/power, then they'll be up to the job on most-all road bikes.

[jonashford]

Darrel are u sure that ur only seeing a 40F drop?

[Darrell Taylor]

Darrel are u sure that ur only seeing a 40F drop?

yes jon approx 410 on a normal head 370 380 on avanti this is under plug temp

[soulsurfer]

Does the jetting require resetting if switching to one of these heads?

[jonashford]

Ok, Darrel, thnx, just that I use centigrade and the sensor is under the plug. When I had my tuned rb 236 std cyl head, using a tto gauge at 65 - 75 mph it would go as high as 220 degrees. With my steel lined rb 260 with ron moss head at 65 - 75 mph its only ever been as high as 187 degrees. So it runs a lot cooler than before. this is on the road not a track so maybe thats making the difference?? What do you reckon?


cheers

[speedy]

A quick basic conversion in degrees,for farenheit,double you centigrade reading and add 28.Ie, if you have a reading of 187 degrees centigrade,then it's 402 degrees farenheit.Cheers Speedy.