5 and this dish is directly under the open portion of the chamber itself, then you still retain this quench area and when the piston comes up to TDC, there is essentially NO space between the piston and the head deck surface, so the combustion chamber is now confined to only the small region that is in the head around the valves and in that little dish pocket in the piston as well. This would be similar to the open N-42 and Z N-47 heads.Ģ) If you manufacture a piston with a dish large enough to drop the compression ratio by. 5 just by using a taller head gasket, now the piston is further away from the head deck surface and now you have lost your quench/squish as the chamber is now an open chamber and extends over the entire cylinder, not confined to the smaller open region that surrounds the valve in the head, i.e. If you can lower the comp ratio on an engine with a nice high squish/quench head, then yes, the engine will be less sensitive to fuel grade and less prone to detonation, however, it is “HOW” you lower the compression ratio that makes the difference.ġ) If you lower the comp ratio by. By adding a thicker gasket you are increasing this piston to head clearance therefore the quench then no longer exists. Quench is only achieved within a given piston to head clearance. I’m much better at conveying ideas visually. (It sure would be much easier if I could draw this out. I’ll try and explain this in a different way. 5 by only using a thicker head gasket wouldn’t help make the engine less prone to detonation?
You understand that the quench is an important aspect of detonation resistance, but don’t understand why lowering the comp ratio by. That is based on two IFs: IF I understand what you are saying your neighbor is saying Īnd IF I am not HORRIBLY misconceived on piston to head clearances. the PISTON keeps gases out of that area (effectively enough) and prevents the "badness" he is seeing. I think your neighbor is failing to realize that our pistons are built to all but impact the cylinder head in that section where the combustion chamber is flat and level with the deck of the head. According to Him itĪlso causes detonation, and loss of power due to the shock waves of burned and unburned gases in the gap area as used with the original gasket. Therefore this causes gases to remain in the peanut shape area, and this results in burned and unburned gases in the gap area.
He overlooked my p90, and advised me to have aĬustom head gasket made to fully have the shape of the peanut shapeĬhamber due to the fact that, the original gasket only covers the roundĪrea of the chamber and leaves a gap in the peanut shape area. While performing the task, I wasĬonfronted by my 72 year old neighbor who claims to have modified engines in the 1954. I have been reading this post and have a few questions?.
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