SOHC TURBOED KA - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TonysS13 · 07-14-2002, 08:52 PM

im doing a ka t in about a month ur 2
i have a 90 240sx sohc
everyone i tell tells me to go with a dohc and then turbo it
but why?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>? sohc has like 15hp less than a dohc so whats the big deal ??
and then others say go with a sr ,to me a sr is a boosted ka with better internals <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>

whateverjames · 07-14-2002, 11:00 PM

those are the type of people you just have to ignore. i haven't lost to a DOHC yet, and i have a SOHC as well. a DOHC would be better to turbo because there are more kits out there. but as far as 15 extra horsepower, that comes a lot from the higher compression. and if you rebuilt the motors, they'd have around 8.5:1 anyway.

sometimes the SR is the way to go, if you have a bad transmission, or don't feel like ordering custom pistons for a SOHC and waiting for months. or waiting for somebody to fabricate a home made exhaust manifold for the SOHC, and SR is the way to go.

as far as all of the differences in the KA and SR, i don't know them all, i'll let an expert tell these. but the displacement is smaller and the peak torque and horsepower is higher.

Fresh 240SX · 07-14-2002, 11:22 PM

Well the KA is an Iron block engine... as the SR is Aluminum...

I dont want to do either of these two things....
1. Get Flamed
2. Start a KA Vs SR thread that will eventually be locked anyways.

so heres what i have to say take it for what its worth....

If i was going to turbo a KA which i am these are the points i have to look at when considering KA or SR

KA engines are basicly a dime a dozen over here so you break something odds are you can have it replaced ASAP.

KA Engines have more displacement meaning more torque can be made

KA has iron block which is stronger than SR's ALU block

As for the SOHC Vs DOHC.... personally I would use the DOHC which i plan on swapping into my '89.... BECAUSE, 89-90 only used the SOHC, therefore...... theres more out there for the DOHC engine because it was used in both the S13 & S14...

Finally...

DOHC.... i see it as the more valves i can get open and closed due to there being more lobes doing this work in a DOHC engine makes it more effective.... not that the SOHC is any less of an engine because if you rebuilt like whateverjames says your gonna want low compression for that turbo so the DOHC will lose its higher compression advantage over the SOHC and they will basicly be equal...

but when it boils down to it i still like saying to my one friend with his 1993 Z24..... WTF... SOHC 3.1L V6.... what a POS you own... LOL

do0ke · 07-15-2002, 05:33 PM

How much would a dohc cost anyways? I live in california and thinking of doing a dohc swap into my 90 s13. I just like the feeling of a DUAL (not single) over head cam. thats why.

07-14-2002, 08:52 PM	#1
TonysS13 Leaky Injector Join Date: Dec 2001 Posts: 136 Trader Rating: (0) Feedback Score: 0 reviews	im doing a ka t in about a month ur 2 i have a 90 240sx sohc everyone i tell tells me to go with a dohc and then turbo it but why?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>? sohc has like 15hp less than a dohc so whats the big deal ?? and then others say go with a sr ,to me a sr is a boosted ka with better internals <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'> __________________ RB25DET Powered S13

07-14-2002, 11:00 PM	#2
whateverjames Nissanaholic! Join Date: Jul 2001 Location: St. Louis Age: 45 Posts: 2,263 Trader Rating: (0) Feedback Score: 0 reviews	those are the type of people you just have to ignore. i haven't lost to a DOHC yet, and i have a SOHC as well. a DOHC would be better to turbo because there are more kits out there. but as far as 15 extra horsepower, that comes a lot from the higher compression. and if you rebuilt the motors, they'd have around 8.5:1 anyway. sometimes the SR is the way to go, if you have a bad transmission, or don't feel like ordering custom pistons for a SOHC and waiting for months. or waiting for somebody to fabricate a home made exhaust manifold for the SOHC, and SR is the way to go. as far as all of the differences in the KA and SR, i don't know them all, i'll let an expert tell these. but the displacement is smaller and the peak torque and horsepower is higher. __________________ 02 Blazer X - 90 240SX w/SR oh noes

07-14-2002, 11:22 PM	#3
Fresh 240SX Zilvia Junkie Join Date: Mar 2002 Location: Niagara Region, Canada Age: 41 Posts: 478 Trader Rating: (0) Feedback Score: 0 reviews	Well the KA is an Iron block engine... as the SR is Aluminum... I dont want to do either of these two things.... 1. Get Flamed 2. Start a KA Vs SR thread that will eventually be locked anyways. so heres what i have to say take it for what its worth.... If i was going to turbo a KA which i am these are the points i have to look at when considering KA or SR KA engines are basicly a dime a dozen over here so you break something odds are you can have it replaced ASAP. KA Engines have more displacement meaning more torque can be made KA has iron block which is stronger than SR's ALU block As for the SOHC Vs DOHC.... personally I would use the DOHC which i plan on swapping into my '89.... BECAUSE, 89-90 only used the SOHC, therefore...... theres more out there for the DOHC engine because it was used in both the S13 & S14... Finally... DOHC.... i see it as the more valves i can get open and closed due to there being more lobes doing this work in a DOHC engine makes it more effective.... not that the SOHC is any less of an engine because if you rebuilt like whateverjames says your gonna want low compression for that turbo so the DOHC will lose its higher compression advantage over the SOHC and they will basicly be equal... but when it boils down to it i still like saying to my one friend with his 1993 Z24..... WTF... SOHC 3.1L V6.... what a POS you own... LOL __________________

07-15-2002, 05:33 PM	#4
do0ke Join Date: May 2002 Posts: 34 Trader Rating: (0) Feedback Score: 0 reviews	How much would a dohc cost anyways? I live in california and thinking of doing a dohc swap into my 90 s13. I just like the feeling of a DUAL (not single) over head cam. thats why. __________________ "How does Top Secret make a Toyota Supra go fast? Stick a Nissan engine in it." - SCC