What is the engine codes for the U.S. Accord (mine) and the TSX? I thought the Accord engine was K24A but then I heard it's a K24A4 and the TSX is what, a K24A2 or something like that? Also, when is the VTEC transition for the K24 motors (I'm assuming the TSX and Accords are the same)? Thanks

 

Well, the TSX is the K24A2 and VTEC (the actual changing to the larger lobe) occurs at 6000RPM, prior to that it is all the cam gear adjusting the retard or advance the entire cam shaft.

As for the Accord, I do not know, but your owners manual should tell you.

 

Thanks, then mine must be the K24A4. But I doubt the VTEC transition is 6K on both the K24A2 and the K24A4 since the Accord's redline is only 6500rpm. That would suck to only have 500 revs of VTEC! Do any of you know? I'm guessing around 4500 but I'd like to know for sure. To be honest I can't feel it but I don't usually get on it really hard. Any other info you guys know on the K series engines is greatly appreciated.

Thanks!
Slats

 

The Honda Element is a K24A4 so I'm pretty sure that's what the I-4 USDM Accord is (160 hp).

As moda_way mentioned, TSX is K24A2.

 

the k24a4 does not have a cam changing system(the classic defintion of vtec) like the tsx and only has ivtec which varies the intake angle slightly during the entire rev range.

 

No it's not the same engine. It is a K24A? but is tuned differently than the Accord's. The output is the same but the torque peaks lower, and the horsepower peaks at higher rpms.

Tinky, are you sure about that?? I'm almost positive the Accord engine (like the TSX) has VTEC...the iVTEC just adds variable timing control...anyone else want to chime in here???

 

The Accord is a K-series 2.4L DOHC i-VTEC engine... I don't see how that setup is any different than the TSX. It isn't exactly the same engine, though.

 

You (and everyone else that wants to know about the K-series) should go buy the latest issue of Import Tuner. It's all about the K-series engines. It focuses on the k20 but there is some stuff about the k24 in there as well.

 

I thought the Accords was just a destroked K24A2 w/out the DBW and VSA (until this year), but again... I'm trying to find something on it.

 

Just found this:
-2,354 cc 2.4 liters in-line 4 front engine with 87 mm bore, 99 mm stroke, 9.7 compression ratio, double overhead cam, variable valve timing/camshaft and four valves per cylinder
-Power: 119 kW , 160 HP SAE @ 5,500 rpm; 161 ft lb , 218 Nm @ 4,500 rpm

But it doesn't tell me engine designation. And yes, stroke is removed out of this engine.

 

TSX vtec (change in cam lobe) operates on both the intake and exhaust valves, whereas in the accord only the intake valves have multiple cam profiles. TSX also has higher compression. Its like the difference between the base rsx and rsx type s motors.

All VTEC and i-VTEC engines have the cam changing mechanism, the "i" means it has some additional feature. i-VTEC in the K series stands for "variable valve timing with electronic lift control + VTC"... the "i" means it has VTC or variable timing control, which advances and retards the intake cam timing.

The i-VTEC name is a bit confusing because it means different things in other honda engines. For example the i-VTEC V6's in the accord hybrid and oddyssey don't have VTC. Instead the "i" means it has VCM or variable cylinder management (cylinder diactivation).

The new R18 engines in the 2006 civic also has i-VTEC but it doesn't mean the same thing as in the K series motors or J series V6.

 

Yeup... what shabaaz said. accord's engine is vtec only on intake. Not both (intake and exhaust) like the TSX is.

 

From www.acura.com

 

DBW??? Also, I honestly though the VTEC systems would be the same, but the TSX's higher redline, higher compression, and better exhaust would also explain the power differences. BTW, I read that K-series article. It was good but mainly about the K20.

 

Seems like honda doesn't want the vtec dohc (with exhast vtec) system to come over here... and just reserve it for the Acura line up. It's a shame, I would have loved for the Civic Type R to make it over here.