Opel Forums - View Single Post - Side By Side Cylinder Head Comparisons/ RallyBob's Performance Suggestions

jeff denton · 12-14-2005

So the 1.9S is 9 to 1 cr, then what difference is it from a regular 1.9, isn't it 9 to 1 cr also?
In perusing my "new" 1.9H head, (thanks Jim, USA Opels!) I can't really see anything outstanding different about it. Except that maybe the combustion chamber is closer to the deck, know what I mean? It looks like the head has been milled a bunch, the dimples are shallower and the Intake seat is right next to the edge between the chamber and deck. But in measuring the height of the head, from the deck to the valve cover rail, it is actually .015" bigger than a 12 bolt head I have to compare.
I'll try to remember to take my camera to work tomorrow and get some shots up here.
I never did find the spec as to what the chamber's volume should be, I thought I saw it here once but can't find it again. Didn't Bob have them all measured out for us somewhere?
Geez I hope I can make 11 to 1 cr somehow. I just love the smell of 110 octane racing fuel exhaust first thing in the morning...

12-14-2005	#40 (permalink)
jeff denton former opel racer Join Date: Nov 2002 Location: near some glaciers Posts: 2,774 Classified Rating: 0% (0)	So the 1.9S is 9 to 1 cr, then what difference is it from a regular 1.9, isn't it 9 to 1 cr also? In perusing my "new" 1.9H head, (thanks Jim, USA Opels!) I can't really see anything outstanding different about it. Except that maybe the combustion chamber is closer to the deck, know what I mean? It looks like the head has been milled a bunch, the dimples are shallower and the Intake seat is right next to the edge between the chamber and deck. But in measuring the height of the head, from the deck to the valve cover rail, it is actually .015" bigger than a 12 bolt head I have to compare. I'll try to remember to take my camera to work tomorrow and get some shots up here. I never did find the spec as to what the chamber's volume should be, I thought I saw it here once but can't find it again. Didn't Bob have them all measured out for us somewhere? Geez I hope I can make 11 to 1 cr somehow. I just love the smell of 110 octane racing fuel exhaust first thing in the morning...