flattops AND aussie's?
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flattops AND aussie's?
hello,
When i opt to throw in some KB flattop pistons as showed at Tims website, i should get 10 to 10.5 :1 compression with stock heads, right?
Is it then possible, in the future, to still put some aussie heads on them in order to get the CR still higher?
or would i be banging my valves then?
i'm looking for a way to increase CR significant now (on a budget) and MAYBE do some more in the future, without disassembling everything again.
Also, would the $150 KB hyperteutic flattops fit right into my engine? Same pin's etc.?
Can it be done by myself, being not an idiot with 2 left hands, but not a daytime car mechanic also?
thank you.
regards,
Stef.
When i opt to throw in some KB flattop pistons as showed at Tims website, i should get 10 to 10.5 :1 compression with stock heads, right?
Is it then possible, in the future, to still put some aussie heads on them in order to get the CR still higher?
or would i be banging my valves then?
i'm looking for a way to increase CR significant now (on a budget) and MAYBE do some more in the future, without disassembling everything again.
Also, would the $150 KB hyperteutic flattops fit right into my engine? Same pin's etc.?
Can it be done by myself, being not an idiot with 2 left hands, but not a daytime car mechanic also?
thank you.
regards,
Stef.
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99.9999% of the time i will run propane/butane 40/60, thats what's propane called in the netherlands.... In the winter, they turn the mixture in 60/40.... Not purely 100% prop. unfortunately..
but... it'll do.
For the other .0001%... Well, octane premium is here 93 (it's 98Ron, but measured differend as i understood correct, so it comes at 93..)
but... it'll do.
For the other .0001%... Well, octane premium is here 93 (it's 98Ron, but measured differend as i understood correct, so it comes at 93..)
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Re: Flattops and aussies
Hello Steph.
I would be cautious about raising the CR too high. My experience shows that at CR 10.8:1 with open-chamber 2V heads detonation is a real possibility, especially where the cam is inappropriately chosen. My initial cam in a 400 was fine because I had a longer exhaust duration: the next cam built cylinder pressure too high and too rapidly leading to detonation-even with pure propane, although not as pronounced as with propane/butane mixtures.
To be honest, you should aim for 10-10.5:1 CR with closed chamber 302 aussie heads, given the lack of access to straight propane. This should give you Steph a Lincoln with great bottom end and reasonable running costs. And with a good margin of safety should they stuff around with the percentages of propane/butane-not an uncommon situation here in AUS.
Hope this helps.
Craig
I would be cautious about raising the CR too high. My experience shows that at CR 10.8:1 with open-chamber 2V heads detonation is a real possibility, especially where the cam is inappropriately chosen. My initial cam in a 400 was fine because I had a longer exhaust duration: the next cam built cylinder pressure too high and too rapidly leading to detonation-even with pure propane, although not as pronounced as with propane/butane mixtures.
To be honest, you should aim for 10-10.5:1 CR with closed chamber 302 aussie heads, given the lack of access to straight propane. This should give you Steph a Lincoln with great bottom end and reasonable running costs. And with a good margin of safety should they stuff around with the percentages of propane/butane-not an uncommon situation here in AUS.
Hope this helps.
Craig
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ok.
Isn't it better then to go with the flat tops alone, getting 9.5 to 9.8:1Cr and leave the heads stock?
It's the cheapest way i guess?
i was thinking 10 to 10.5:1 with the flattops, but that's with the special made high-dollar pistons.
Tip said that the $150 set pistons, KB flattops, would raise it to 9.5:1
When i add a little bit of deck milling, i come to 9.7-9.8:1 i guess?
Isn't it better then to go with the flat tops alone, getting 9.5 to 9.8:1Cr and leave the heads stock?
It's the cheapest way i guess?
i was thinking 10 to 10.5:1 with the flattops, but that's with the special made high-dollar pistons.
Tip said that the $150 set pistons, KB flattops, would raise it to 9.5:1
When i add a little bit of deck milling, i come to 9.7-9.8:1 i guess?
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From: patterson, ca
I would try to keep the bottom end alone if nothing is wrong with it. i was goin to put a set of aussie heads on and call it a day, but then i sold the truck. . . which reminds me, i have a set of aussie's in the garage i dont need anymore.
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Friend 
Can you PM me some pictures of the aussies?
Are the cast, or alloy?
what rockers are on them?
Stud's or pedestal?
Thanks.
stef.
Can you PM me some pictures of the aussies?
Are the cast, or alloy?
what rockers are on them?
Stud's or pedestal?
Thanks.
stef.
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