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SykikCHIMP
02-11-2002, 10:12 PM
I can feel a big difference in how my car pulls right at about 5,000-5,500 rpm. Almost feels like a vtec from a honda (not to say its ANYTHING like a honda) I've driven a lot of honda's and I actually feel a difference that rivals a prelude hitting vtec. very odd??

btw, I have a 92' 240 5-speed.

Anyone else get this? any explanations as to why?

mmmm_beer
02-11-2002, 10:20 PM
torque peak?
horsepower peak?
engine about to head south?

you know...they say "she runs the hardest right before she lets go" http://www.freshalloy.com/

SykikCHIMP
02-11-2002, 10:24 PM
from what i know the Torque peak should be right around 4,000 rpm, and HP peak around 6,000 (I think) So it's just about in the middle.

I know the engine is going nowhere south. She's in beautiful condition.

SykikCHIMP
02-12-2002, 07:31 AM
bump

SRedSileighty
02-12-2002, 07:40 AM
intake butterflys

SykikCHIMP
02-12-2002, 07:42 AM
can you elaborate? And if it's that, why wouldn't it occur on all cars?

S14GTR
02-12-2002, 07:54 AM
About that intake butterfly...

Does every KA24DE have it ?

I have heard that you could remove it to get more peak HP..is it realy worth it? or you loose too much torque ?

Mark slide squad
02-12-2002, 07:58 AM
All S13 KA's have the butterflies. S14 KA does not. Don't remove the butterfly system, except if you are going turbo KA.


Originally posted by 240 KSX:
About that intake butterfly...

Does every KA24DE have it ?

I have heard that you could remove it to get more peak HP..is it realy worth it? or you loose too much torque ?<font size="2" face="Verdana, Arial[/img]

lenso
02-12-2002, 08:25 AM
Originally posted by Mark slide squad:
[QB]All S13 KA's have the butterflies. S14 KA does not. Don't remove the butterfly system, except if you are going turbo KA.
<font size="2" face="Verdana, Arial[/img]Why not?

02-12-2002, 09:32 AM
The intake butterfly system (AKA SCV: Swirl Control Valve) should open gradually, so you shouldn't feel any "kick" from it.

The purpose of the SCV is for emissions and fuel economy, mostly at idle, and ostensibly to add some low-end torque by throttling the air in the intake runners and promoting "swirl" which results in a cleaner, more complete burn. It was removed at sometime during the 1993 model year, perhaps coincident with cam changes during that model year as well.

Asad

ADAM HUTCHINSON
02-12-2002, 09:35 AM
i ripped mine out and ran NA motor for 2 years with no issues..

gforce240sx
02-12-2002, 01:31 PM
Originally posted by Sykikchimp:
I can feel a big difference in how my car pulls right at about 5,000-5,500 rpm. Almost feels like a vtec from a honda (not to say its ANYTHING like a honda) I've driven a lot of honda's and I actually feel a difference that rivals a prelude hitting vtec. very odd??

Anyone else get this? any explanations as to why?<font size="2" face="Verdana, Arial[/img]Isn't it the tip-n-retard thing? Anywaz, if you get an ECU upgrade, you won't notice it. It's just one smooth rev. No VTEC kick.

Danny.

SykikCHIMP
02-12-2002, 04:19 PM
Originally posted by asad137:
The intake butterfly system (AKA SCV: Swirl Control Valve) should open gradually, so you shouldn't feel any "kick" from it.

The purpose of the SCV is for emissions and fuel economy, mostly at idle, and ostensibly to add some low-end torque by throttling the air in the intake runners and promoting "swirl" which results in a cleaner, more complete burn. It was removed at sometime during the 1993 model year, perhaps coincident with cam changes during that model year as well.

Asad<font size="2" face="Verdana, Arial[/img]So if it Is giving me a kick, then maybe it indicates something is wrong with it?? It doesn't do it all the time, just randomly.

neurovish
02-12-2002, 10:24 PM
I notice a kick just above 3k in my car...nothing huge, but still noticeable

Chernobyl
02-12-2002, 11:14 PM
the above 3k kick is just your car coming on cam. probably has nothing to do with the butterflies. as for the original question, i'd check whatever mechanism that opens the butterflies for correct operation.

redlyne
02-13-2002, 09:25 AM
When I pulled my SOHC motor out, the butterflies would stick for a second, and then give... it sounds like that's what's happening. Get in there and move it manually, see if it moves freely. Check the vaccuum hose that activates it, check the diaphragm that actually moves them. As for taking them out, I've never heard anything bad about it. It might rough your idle up a bit, but other than that, I don't see it being a problem.

And horsepower peaks at 5200 or so.

Sean


Originally posted by Sykikchimp:
So if it Is giving me a kick, then maybe it indicates something is wrong with it?? It doesn't do it all the time, just randomly.<font size="2" face="Verdana, Arial[/img]

**DONOTDELETE**
02-13-2002, 11:53 AM
All S13 KA's have the butterflies. S14 KA does not. Don't remove the butterfly system, except if you are going turbo KA.

Correction Mark slide squad, I have 93 and it came stock with no butterflys.

S14GTR
02-13-2002, 01:28 PM
Thanks, I tought that all KA24DE where the same (except for Cam and Piston)

TitaniusMaximus
02-13-2002, 04:17 PM
Only the 91-93 KA24DEs had the butterfly thing...

Tae

02-13-2002, 07:48 PM
Originally posted by Titanius Maximus:
Only the 91-93 KA24DEs had the butterfly thing...
<font size="2" face="Verdana, Arial[/img]Like I posted earlier...they were taken out sometime during the 1993 model year. Some 93's have them, some don't.

Asad

**DONOTDELETE**
02-13-2002, 08:12 PM
93 here too, no butterfly.

**DONOTDELETE**
02-13-2002, 08:15 PM
Originally posted by mlsaint78:
torque peak?
horsepower peak?
engine about to head south?

you know...they say "she runs the hardest right before she lets go" http://www.freshalloy.com/ <font size="2" face="Verdana, Arial[/img]AMEN! i can testify to that one!

neurovish
02-13-2002, 08:44 PM
Originally posted by SixBanger:
the above 3k kick is just your car coming on cam. probably has nothing to do with the butterflies. as for the original question, i'd check whatever mechanism that opens the butterflies for correct operation.<font size="2" face="Verdana, Arial[/img]I have an s14, so it definately wouldn't be the butterflies...what does 'on cam' mean? I've never heard this before

BioSehnsucht
02-13-2002, 10:15 PM
I think he means that you're hitting the sweet spot in the rpm range where the cam profiles are tuned for.. since in a non-variable system you can only tune specificly for one area, or broadly over a broader area.. but there always be a point at which it peaks..