Valve reliefs
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Valve reliefs
I'm going for an ABA short block Conversion, and I already have a new set of forged pistons for this engine, but they were intended for an VW 8v engine.
I hope someone could suply me drawings of the valve reliefs I'll have to machine on these pistons, for all five valves, because I'l be running bigger cams too.
I don't have any other engine to take one piston apart to check the measurements now, cause I have to use the car and I'll just drop in the new engine when it's done.
I've alredy take some measurements from the Head, but I wan't to know if they are right.
Can anyone help me with the dimensions?
I hope someone could suply me drawings of the valve reliefs I'll have to machine on these pistons, for all five valves, because I'l be running bigger cams too.
I don't have any other engine to take one piston apart to check the measurements now, cause I have to use the car and I'll just drop in the new engine when it's done.
I've alredy take some measurements from the Head, but I wan't to know if they are right.
Can anyone help me with the dimensions?
Thread Starter
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Joined: Mar 2004
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Re: Valve reliefs
the cams are 284intakex286 exaust
valve timing is 36-68 - 76-38
Eurospec part number ECM 109 3704
I'm Also runing a custom adjustable cam sprocket (stil to be machined)
Valves are stock diameter 29.9 ex. and 26.9 int.
I'm thinking about machining a custom adjustable cam gear, so I can dial in the lobe center. (probably I'll only change once or twice, because it will be a PITA to work with)
The pistons aren't by my side right now, to give you all the dish dimensions, but I remenber I checked their volume around 15.5cc.
Pistons are 83.5mm.
I planed on doing a model of the combustion camber using plastic body filler, to check everything....
valve timing is 36-68 - 76-38
Eurospec part number ECM 109 3704
I'm Also runing a custom adjustable cam sprocket (stil to be machined)
Valves are stock diameter 29.9 ex. and 26.9 int.
I'm thinking about machining a custom adjustable cam gear, so I can dial in the lobe center. (probably I'll only change once or twice, because it will be a PITA to work with)
The pistons aren't by my side right now, to give you all the dish dimensions, but I remenber I checked their volume around 15.5cc.
Pistons are 83.5mm.
I planed on doing a model of the combustion camber using plastic body filler, to check everything....
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Re: If he's going to be running lower compression, valve reliefs may not be necessary.....
Yeah, I know it would be much easier to get pistons done specific for this engine, but I live in Brazil, and things get really expensive to import (70% import taxes for anything above US$200 with shipping included)
And these pistons are made here, much cheaper (probably the same price you're used to pay, but without the taxes), and I already have them....
I asked a few people about custom pistons (Iapel, Iasa, Powertech)and they simply doesn't make them.
They told me that I had to buy a set of 8v pistons and machine the reliefs (the same pistons I already had laying around)
A set of Ross, wiseco, or JE pistons would cost at least double the price you pay for them in the US.
And, still talking about the reliefs, even with a low compression piston I'll still need at least the midle intake valve relief.
And these pistons are made here, much cheaper (probably the same price you're used to pay, but without the taxes), and I already have them....
I asked a few people about custom pistons (Iapel, Iasa, Powertech)and they simply doesn't make them.
They told me that I had to buy a set of 8v pistons and machine the reliefs (the same pistons I already had laying around)
A set of Ross, wiseco, or JE pistons would cost at least double the price you pay for them in the US.
And, still talking about the reliefs, even with a low compression piston I'll still need at least the midle intake valve relief.
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Thread Starter
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Re: Would you like a picture of a stock piston? I could get you that.....
Thank you, but I already have a few pictures, from stock and from forged JE and Wiseco, I really need measurements or drawings.
I already disassembled these engines, but I don't have any on hand now.
I already disassembled these engines, but I don't have any on hand now.
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