Compression ratio

[tom upton]

Needing to calculate the compression ratio for a mild Oliver 310 I am building. ( Like to stick with 3 7/8 x 4 3/8) I have what I think is a decent 283 2 piece gas head out of a 1800C. Does any one happen to have the aprox. volume of the combustion chamber they could share with me to avoid having to cc? ( dont think its ever been surfaced) My plan is to use flat top diesel pistons if ratio is going to turn out high enough? Looking for at least 11:1. I dont want to get into using a 4 inch sleeve and domed pistons if I dont have to? Thanks for any help as I know there must be others on here that have built something similiar, and could save me some time if I am not even going to be close to 11:1?

 

[VicS]

Needing to calculate the compression ratio for a mild Oliver 310 I am building. ( Like to stick with 3 7/8 x 4 3/8) I have what I think is a decent 283 2 piece gas head out of a 1800C. Does any one happen to have the aprox. volume of the combustion chamber they could share with me to avoid having to cc? ( dont think its ever been surfaced) My plan is to use flat top diesel pistons if ratio is going to turn out high enough? Looking for at least 11:1. I dont want to get into using a 4 inch sleeve and domed pistons if I dont have to? Thanks for any help as I know there must be others on here that have built something similiar, and could save me some time if I am not even going to be close to 11:1?

You using a 310 Diesel to start with. If you have the gas head . Drill a small hole in some plexiglas. Get a syringe and see how much it holds. Clamp the plexiglas and the headgasket to the block. Or Pi R Square the gasket.. The valves are in a different order on a Diesel. So will have to use a gas cam with a gas head. Sorry if you know this.

 

[tom upton]

You using a 310 Diesel to start with. If you have the gas head . Drill a small hole in some plexiglas. Get a syringe and see how much it holds. Clamp the plexiglas and the headgasket to the block. Or Pi R Square the gasket.. The valves are in a different order on a Diesel. So will have to use a gas cam with a gas head. Sorry if you know this.

Thanks for the reply. Using gas block,head,cam from 283. Using a 310 diesel crank and thinking of using indirect 3 7/8 diesel flat top pistons. I intend to use your suggestion to cc the combustion chamber and figure out C.R. I thought someone might know if I was even going to be close to C.R. I am looking for, as I dont want to get into boring block and using 4 inch domed pistons if I dont have to, but you are right shouldnt be that big a deal to cc myself. Thanks Tom

 

[tom upton]

Did the plexiglass thing and some math. Ends up with diesel flat top pistons compression ratio is just over 10.5:1. I would like to get cam ground. Would someone be gracious enough to share cam specs they use for similiar application, and /or name of good place to have it ground?

 

[VicS]

Did the plexiglass thing and some math. Ends up with diesel flat top pistons compression ratio is just over 10.5:1. I would like to get cam ground. Would someone be gracious enough to share cam specs they use for similiar application, and /or name of good place to have it ground?

Last one I got ground was at Chuck Vogel's at Effingham Il. For a Diesel. Before that. Had one ground at competition cams at Memphis Tn. Got a chevy trailer towing grind. For a 350 engine.

 

[mkuhns]

Needing to calculate the compression ratio for a mild Oliver 310 I am building. ( Like to stick with 3 7/8 x 4 3/8) I have what I think is a decent 283 2 piece gas head out of a 1800C. Does any one happen to have the aprox. volume of the combustion chamber they could share with me to avoid having to cc? ( dont think its ever been surfaced) My plan is to use flat top diesel pistons if ratio is going to turn out high enough? Looking for at least 11:1. I dont want to get into using a 4 inch sleeve and domed pistons if I dont have to? Thanks for any help as I know there must be others on here that have built something similiar, and could save me some time if I am not even going to be close to 11:1?

A stock head not planned much is about 75 cc. Summit racing has a good compression ratio calculator and there are others out there on the web. When I was figuring out flat top pistons for that combo, I thought compression ratio was quite a bit higher than 10.5:1

 

[RCP]

Needing to calculate the compression ratio for a mild Oliver 310 I am building. ( Like to stick with 3 7/8 x 4 3/8) I have what I think is a decent 283 2 piece gas head out of a 1800C. Does any one happen to have the aprox. volume of the combustion chamber they could share with me to avoid having to cc? ( dont think its ever been surfaced) My plan is to use flat top diesel pistons if ratio is going to turn out high enough? Looking for at least 11:1. I dont want to get into using a 4 inch sleeve and domed pistons if I dont have to? Thanks for any help as I know there must be others on here that have built something similiar, and could save me some time if I am not even going to be close to 11:1?

Not to hijack your thread, but I didn't think the 283 head would bolt to a 310 block?