Small port A15
Posted: Sun Aug 30, 2015 9:11 pm
I have an early A15 engine that I am planning to rebuild.
It has a small port H81 head, that seems to be a rarity amongst A15s.
according to the bible 1200 wiki, the H81 head was the 'swedish emissions head'...wtf?
not sure how it ended up in little ole NZ!
question is, I was considering giving the engine the 1608cc treatment, and am wondering if the head will constrain flows to an extent that I should look for an oval port and start from there?
I am not looking to build a 7500rpm screamer..more a higher displacement led torquey (for a 1600!), motor. so, in some ways, I'm wondering if the smaller ports could help (valve size essentially the same).
wots the general view on the small ports?
cheers
It has a small port H81 head, that seems to be a rarity amongst A15s.
according to the bible 1200 wiki, the H81 head was the 'swedish emissions head'...wtf?
not sure how it ended up in little ole NZ!
question is, I was considering giving the engine the 1608cc treatment, and am wondering if the head will constrain flows to an extent that I should look for an oval port and start from there?
I am not looking to build a 7500rpm screamer..more a higher displacement led torquey (for a 1600!), motor. so, in some ways, I'm wondering if the smaller ports could help (valve size essentially the same).
wots the general view on the small ports?
cheers