Support GPR Camp!!

BRK 88 For a new Generation

Create a thread about your bike.
Post Reply
User avatar
kaldis12
Posts: 260
Joined: Tue Jul 31, 2018 3:04 pm
Location: Hungary
x 25
x 159

BRK 88 For a new Generation

Post by kaldis12 » Thu Jan 02, 2020 10:14 am

Got a new bigger project running along with the other one...

For this one we went with a BRK 88 with its 45mm stroker crankshaft.
About the cylinder, got a nice finish but it turns out that it has the same problems as the other BRK cylinders. Poor nicasil coating... it really likes to chip...
Ports have a nice finish but they are kinda out of symmetrical places.
Channels are bad, but correctable, boost channel is stupid...
Image
Image
Image
Image
Last edited by kaldis12 on Sat Jan 18, 2020 2:10 pm, edited 1 time in total.
1 x

User avatar
kaldis12
Posts: 260
Joined: Tue Jul 31, 2018 3:04 pm
Location: Hungary
x 25
x 159

BRK 88 For a new Generation: Porting

Post by kaldis12 » Thu Jan 02, 2020 10:42 am

This cylinder has to go through porting of course.
Stock timings are 200 degree exhaust and 128 degree. Going for 200/130 because we have a bit higher revving exhaust. Want a bit higher, narrower powerband. Will be okay as now the transfers are higher than the boost by 2 degrees.
Image
Image
Image
Image

New Channel outlay
Image
1 x

User avatar
toratora
Posts: 3161
Joined: Wed Oct 11, 2017 1:05 am
Location: San Francisco
Replica: Derbi GPR
Cagiva Mito
Cobra CX65
Aprilia RS50
x 1768
x 1977
Contact:

BRK 88 For a new Generation

Post by toratora » Mon Jan 06, 2020 8:39 pm

BRK seems to be a notch up from the Airsal. How did your porting turn out?
0 x

User avatar
kaldis12
Posts: 260
Joined: Tue Jul 31, 2018 3:04 pm
Location: Hungary
x 25
x 159

Re: BRK 88 For a new Generation

Post by kaldis12 » Thu Jan 09, 2020 11:33 pm

Brk has a modular head, thats why its better. Nothing else.
Its still under porting, it will be done probably in the next weeks
1 x

Post Reply