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#1
A12 cylinder head-closed chamber-round port
TexasMidget
Posted on: 2020/1/10 3:36
This head came off of an A12 engine. No casting number. Any idea on specifications?
Attach file:  A12.cylinder.head3.jpg (77.57 KB) A12.cylinder.head2.jpg (99.57 KB) A12.cylinder.head1.jpg (72.93 KB) A12.cylinder.head.jpg (69.91 KB)  
#2
Re: A12 cylinder head-closed chamber-round port
Rallytwit
Posted on: 2020/1/10 3:55
Are the ports / valve stems shrouded. It's hard for me to tell but the combustion chambers look very deep and those where the FU / smog head.
#3
Re: A12 cylinder head-closed chamber-round port
TexasMidget
Posted on: 2020/1/10 4:10
Not sure. Someone was offering it to me and sent pictures. Familiar with the deep chamber. Saw that on a H990 head (closed chamber/round port) which came off of a FU engine. Thanks for the response.
#4
Re: A12 cylinder head-closed chamber-round port
D
Posted on: 2020/1/10 5:42
The top A series racing guys that go all out here in Japan
use these kind of heads from their sunny a12 engines. They favor deeper chambers and shape them like this aftermarket chamber https://www.streetmusclemag.com/image/2015/02/20150210_170551.jpg L series version done by TK https://i291.photobucket.com/albums/ll ... /P1141427_zps8dqvjjyk.jpg The rules dont allow welding the chambers but allow opening up the ports then using devcon to cover the water galleries etc. so its easier to get this shape from the humble a12 heads than the pricier h89 which is used happily by street tuners instead.
#5
Re: A12 cylinder head-closed chamber-round port
TexasMidget
Posted on: 2020/1/10 15:14
That is nice work on the chamber. Do they go with flat top pistons due to deeper chamber?
#6
Re: A12 cylinder head-closed chamber-round port
ddgonzal
Posted on: 2020/1/10 19:50
That is a non-American engine
* using RHD cable clutch * 1974-up engine might be early B210. Specs are similar to other A12s, including the small valves looks like a twee Datsun 1000 exhaust manifold?
#7
Re: A12 cylinder head-closed chamber-round port
D
Posted on: 2020/1/11 2:22
Texasmidget, the piston I couldnt see in TKs performanceforums post
but apparently he had the pics on aussiev8 forums. Yet it is the usual Nascar combustion chamber design that is used on everything these days prob originated from Larry Widmer or one of those great Nascar engine builders. It seems to be the most popular chamber design on all V8 engines and circletrack L4 both cross and non crossflow pushrod heads. I guess with bigger bores on an A series such a small chamber if using the A12 head would be fine with flat top pistons if the cam is not too crazy where valve reliefs would be needed.
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