lets talk squeeze: compression ratio
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Senior User
Joined: Nov 2013
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I'm currently in the process of planning out a stroker motor build.
I'm taking a 390 block and going to 445 most likely with one of Barry's kits from Survival Motorsports.
My question lies in what pistons to order. It sounds like dish tops give me a little less than 10:1 and flats in the neighborhood of 11:1.
Now I always thought 11:1 was right around the max with pump gas and I should be safe with a yummy cam.
I would like to here from others what they think before I order.
Thanks!
I'm taking a 390 block and going to 445 most likely with one of Barry's kits from Survival Motorsports.
My question lies in what pistons to order. It sounds like dish tops give me a little less than 10:1 and flats in the neighborhood of 11:1.
Now I always thought 11:1 was right around the max with pump gas and I should be safe with a yummy cam.
I would like to here from others what they think before I order.
Thanks!
Thread Starter
|
Senior User
Joined: Nov 2013
Posts: 286
Likes: 0
It use to be more of a daily but its a weekend toy now.
My goal is to get the best compression ratio for the given fuel to get the most out of it. Its not that I'm looking for every last bit of horse power, but I'd like the most for my buck. And the price doesn't really change depending on the pistons I order.
Hotshot
Joined: Jul 2005
Posts: 13,834
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From: Middle Tn.
Truck is setup as a street toy with the occasional strip action.
It use to be more of a daily but its a weekend toy now.
My goal is to get the best compression ratio for the given fuel to get the most out of it. Its not that I'm looking for every last bit of horse power, but I'd like the most for my buck. And the price doesn't really change depending on the pistons I order.
It use to be more of a daily but its a weekend toy now.
My goal is to get the best compression ratio for the given fuel to get the most out of it. Its not that I'm looking for every last bit of horse power, but I'd like the most for my buck. And the price doesn't really change depending on the pistons I order.
Thread Starter
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Senior User
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Posts: 286
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C6 probably for now..had a stick in it last season but will do the c6 again until I find a proper 4 or 5 speed
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I'm trying to learn if a 11.1 ratio is doable on 93 octane
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More Turbo
Joined: Nov 2004
Posts: 590
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From: in the woods of Maine!
Guys at my machine said I wouldn't really be able to get away with more than 9.8:1 on 91 octane on iron heads. That's most of what I can find around here. 93 is few and far between so can't rely on it. Wish we had M85 
Hotshot
Joined: Jul 2005
Posts: 13,834
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From: Middle Tn.
I'm running the 91 with 10.6:1 but have installed hardened valve seats which I'd recommend no matter what the cr your running.
More Turbo
Joined: Nov 2004
Posts: 590
Likes: 1
From: in the woods of Maine!
Havent been on here in forever. so I ended up scrapping that whole idea with my compression ratio. i put those ported Iron heads on a 390 instead at 10:1. had all new exhaust seats and valve guides installed and new SS valves all around. for the stroker moter i still havent assembled it, but I ended up getting a set of Edelbrock Aluminum heads for it lol
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