Post by justyfied on Oct 17, 2013 10:51:51 GMT -4
Story time:
So I have been working on getting all of the things (TOOLS) I need together to check the chamber volume of a cylinder head.
I want to be able to clarify if the Justy 3 valve head engine has the same compression as what Subaru claims. Then Iam half way through deburing and otherwise opening up the chamber next to the valve seats as well as some metal removal to unshroud the valves. This will increase the flow of the intake and exhaust ports. Iam hoping that the trade off of a reduced compression ratio will be offset by more flow for a net increase in both efficiency and power. I may also at some point have the cylinder head deck surface milled down a bunch to then reduce the chamber volume and thus increase the compression ratio to be more than stock. Now , because I removed all of the sharp edges in the combustion chamber I will hopefully be able to get away with a substantially higher compression without detonation because there is no thin metal edges to glow red hot and start auto combustion -(Detonation).
See how that works, remove metal to both increase air flow and reduce the tendency to detonation. It is a win- win deal!
So I spent $60 on a burette to measure the exact amount of fluid that the chamber displaces.
Another $20 for some really thick PVC plastic sheet to cover up the heads chamber from the piston side.
Another $20 for a really large used metal C clamp to clamp it onto the head
I bought this because the adjustable clamp I had for use in woodworking appeared to be too weak to hold the plastic up tight against the head.
When I poured colored fluid thru the hole I drilled in the plastic sheet into the combustion chamber it would only fill up half way and then leak out.
First I thought it was because the butter I was using to seal the plastic to the head was too weak so I went out and bought a tub of wheel bearing grease.
Another $6 bucks.
So with wheel bearing grease on there and the big C clamp along with the other clamp I figure I will have the answer of how many CC’s of liquid a stock chamber displaces. NO.. no .. not that easy, I still leaks out half way through but this time it is getting by the valve seats of my used cylinder head. I bought this head to swap onto a carb EF12 engine so that the older engine could be installed in a vehicle set up for EFI.
This means that I have to go out and by a Valve spring compressor and Valve seat lapping tool set and try my hand at the tedious job of lapping in valves BEFORE I can finally get the chambers measured before I finish modifying all 3 chambers.
I just had a thought , I could modify a large , long socket tool to be a valve spring compressor along with my big C clamp!
I know, I whine too much, eh?
So I have been working on getting all of the things (TOOLS) I need together to check the chamber volume of a cylinder head.
I want to be able to clarify if the Justy 3 valve head engine has the same compression as what Subaru claims. Then Iam half way through deburing and otherwise opening up the chamber next to the valve seats as well as some metal removal to unshroud the valves. This will increase the flow of the intake and exhaust ports. Iam hoping that the trade off of a reduced compression ratio will be offset by more flow for a net increase in both efficiency and power. I may also at some point have the cylinder head deck surface milled down a bunch to then reduce the chamber volume and thus increase the compression ratio to be more than stock. Now , because I removed all of the sharp edges in the combustion chamber I will hopefully be able to get away with a substantially higher compression without detonation because there is no thin metal edges to glow red hot and start auto combustion -(Detonation).
See how that works, remove metal to both increase air flow and reduce the tendency to detonation. It is a win- win deal!
So I spent $60 on a burette to measure the exact amount of fluid that the chamber displaces.
Another $20 for some really thick PVC plastic sheet to cover up the heads chamber from the piston side.
Another $20 for a really large used metal C clamp to clamp it onto the head
I bought this because the adjustable clamp I had for use in woodworking appeared to be too weak to hold the plastic up tight against the head.
When I poured colored fluid thru the hole I drilled in the plastic sheet into the combustion chamber it would only fill up half way and then leak out.
First I thought it was because the butter I was using to seal the plastic to the head was too weak so I went out and bought a tub of wheel bearing grease.
Another $6 bucks.
So with wheel bearing grease on there and the big C clamp along with the other clamp I figure I will have the answer of how many CC’s of liquid a stock chamber displaces. NO.. no .. not that easy, I still leaks out half way through but this time it is getting by the valve seats of my used cylinder head. I bought this head to swap onto a carb EF12 engine so that the older engine could be installed in a vehicle set up for EFI.
This means that I have to go out and by a Valve spring compressor and Valve seat lapping tool set and try my hand at the tedious job of lapping in valves BEFORE I can finally get the chambers measured before I finish modifying all 3 chambers.
I just had a thought , I could modify a large , long socket tool to be a valve spring compressor along with my big C clamp!
I know, I whine too much, eh?
. I am still waiting to get a chance to pull down a Sherpa engine 
.
. Back in the old days with an old overhead valve head if you didn't have a valve spring compressor you just got a socket about the size of the valve spring & a hammer & held the socket on the valve spring & gave it a couple of belts with the hammer until the collets popped out, with a small block of wood under the valve head ;D.
. 
;D.