How much to install KA24E pistons (9.1:1)in a KA24DE?? Benefits?
How much to install KA24E pistons (9.1:1)in a KA24DE?? Benefits?
I'm new to the threads and was reading about the higher compression pistons, an idea that I like...will this allow the car to rev higher/more safely? Anyway, I'm wondering how much it would be to remove/install the 9.1:1 KA24E pistons available from courtesynissan.com in a 95 240sx with the KA24DE DOHC engine. Also, I'd rather install the 8.6:1 compression pistons, because an 11.1:1 sounds better and safer than an 11.6:1, but they don't sell them at courtesynissan.com...only the 9.1 pistons (if im wrong , please post a link). How much HP could I expect from a mod like this (10 hp I'm guessing?), and would the HP be greater if I replaced the cams while I was at it? Thanks a lot. Dauntless...I know you're knowledgeable on the subject.Marc:D
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Daunttless
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You won't rev any higher, you'll just make more power at the same revs.
You'll get the most out of the horsepower if you do intake/headers/exhaust and mild street cams, you'd be over 200.
Pistons alone you'd be looking at like a 10-20 horsepower increase easy, more with I/H/E.
Also, we haven't pinned down where the 8.6 are out of, but the Nissan half-ton should have 8.6...... : )
You'll get the most out of the horsepower if you do intake/headers/exhaust and mild street cams, you'd be over 200.
Pistons alone you'd be looking at like a 10-20 horsepower increase easy, more with I/H/E.
Also, we haven't pinned down where the 8.6 are out of, but the Nissan half-ton should have 8.6...... : )
thanks for the info
Thanks dauntless...any idea how much it would be to install those puppies...? any advantages/disadvantages of going with the 9.1 over the 8.6? is 11.6 too high on a car w/regular cams? Would it be better to get the 11.6 if I had better cams and stick with the 11.1 if I had regular cams? thanks
one more thing
whats the stock compression on a KA24DE?
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Daunttless
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It doesn't matter, either way you will need to run premium gasoline. : ) As premium as can be bought in your area, always.
The cams won't do much besides make your idle a little rougher and power increase along your whole range. : ) You don't NEED them, its just whenever you are doing high performance modifications, the more mods you have that work in conjunction, the better gain you see from the whole system.
The advantage of the 9.1 is a little more power, the disadvantage is you might be a little more prone to knocking unless you have high grade fuel in your area.
The 8.6 you'll have a little less power ( but still way more than stock ) and you probably won't have a problem even if your premium grade fuel is not as premium as other places. : )
Which one you decide on is based more on what kind of fuel you have in your area versus regular or aftermarket cams. : )
Good Luck!
The cams won't do much besides make your idle a little rougher and power increase along your whole range. : ) You don't NEED them, its just whenever you are doing high performance modifications, the more mods you have that work in conjunction, the better gain you see from the whole system.
The advantage of the 9.1 is a little more power, the disadvantage is you might be a little more prone to knocking unless you have high grade fuel in your area.
The 8.6 you'll have a little less power ( but still way more than stock ) and you probably won't have a problem even if your premium grade fuel is not as premium as other places. : )
Which one you decide on is based more on what kind of fuel you have in your area versus regular or aftermarket cams. : )
Good Luck!
thanks
i can get 93 octane right down town (its what i run in my car anyway), but I know I can get 94 octane at Sunoco...is that high enough? Technoman, whats up!!!! Sucks that the 240sx forum closed down!!!!
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TrunkMonkey
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Re: How much to install KA24E pistons (9.1:1)in a KA24DE?? Benefits?
if you ask a dealer or vendor for 8.6:1 pistons they won't have a clue as to what your talking about. i've got the part #s you need to give them written down somewhere. when i find them i'll post it.MarkEmark wrote:Also, I'd rather install the 8.6:1 compression pistons, because an 11.1:1 sounds better and safer than an 11.6:1, but they don't sell them at courtesynissan.com...only the 9.1 pistons (if im wrong , please post a link).
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Daunttless
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TrunkMonkey
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TrunkMonkey
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TrunkMonkey
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no. the grades have more to do with clearances than anything else. if you replace your pistons with standard 89mm ones then you need to check the grade number punched on the top of the engine block (you have to remove the head). if you have a high mileage engine, make sure the cylinder bores are still within specs. you might need to overbore. if you're staying n/a, i'd recommend doing it anyway for the added displacement.redrocket wrote:whats the difference in the grades? grade 1 being a low grade and grade 3 being a high grade stronger and better than normal?
Robbie
Re: one more thing
according to nissan stock compression on a KA24DE in 1992 was 10.1 then it went to 9.51 in 93 and going to 11.1 will cause unsurpassable valve to piston smash with a higher lift cam unless you carefully check the clearances.MarkEmark wrote:whats the stock compression on a KA24DE?
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Daunttless
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This was told and shown to me by Jerry Rome Nissan when I had a problem with my nissan they did a compression test on my motor and the mechanic said "well your compression total is still 10.1 so your head gasket is fine?" I asked him to show me that because I did not believe him and the analyzer showed it by if I remember 185 psi +- on all 4 cylinders....anyways I had a bad plug wire that was brand new thats how I found that out, I do not think my car is special either and I know nothing was done to it since I've owned it since new and there is only 90,000 miles on it. forgot to add, its the KA24DEDaunttless wrote:Um, I'm not not sure what Nissan you talked to, but stock compression on a KA24 of any year was never 10.1:1.
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Daunttless
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compression ratio, believe me I am more shocked as anyone but I always asked the dealership where I bought it how come I could not run cheap gas in it. I was under the assumption that cr was low in a 4-banger but they were clueless as well. I figured it out myself due to knowing about motors a litlle bit. (I built the 327 in my camaro and it has 12.4:1 cr) and all I can run in my nissan without hesitation and knock is 92 or better. Anything lower then that causes it to run rough and sometimes dieDaunttless wrote:Are you talking cylinder compression or compression ratio?
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Daunttless
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I have owned it since new si nothing has been done to it and yes KA24DE's have varied according to what I have read as well and When investigating it further with these techs they say it varied as much as 10.5:1 I know these guys know what they are doing because they also high performance nissans--in fact they did the owners 300ZXTT over and it pushed 500 horses street legal so I just wanted to add that and not get into a I know it all match--I just stated what they told me and from what I saw for my own eyes...Daunttless wrote:I can't believe that...were you the first owner, or could the guy before you or before him have done something?? The KAs varied a lot from motor to motor, but not THAT much.....
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Daunttless
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TrunkMonkey
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it's impossible to figure out a cars compression ratio by taking a compression test. factory specs is 9.5:1 at 190psi.grygst76 wrote:
This was told and shown to me by Jerry Rome Nissan when I had a problem with my nissan they did a compression test on my motor and the mechanic said "well your compression total is still 10.1 so your head gasket is fine?" I asked him to show me that because I did not believe him and the analyzer showed it by if I remember 185 psi +- on all 4 cylinders....
i understand engines do vary, but not by that much. in order to have a 0.5 difference in compression ratio something would have to have been changed inside your engine. that's not going to happen using factory parts on an assembly line.
yup your right I had them shave the head and install a thinner gasket because I had a feeling the nissan mechanics knew nothing about my car so yes I only have 9.5 crdemcj wrote:it's impossible to figure out a cars compression ratio by taking a compression test. factory specs is 9.5:1 at 190psi.
i understand engines do vary, but not by that much. in order to have a 0.5 difference in compression ratio something would have to have been changed inside your engine. that's not going to happen using factory parts on an assembly line.
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Daunttless
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