I have a k24a4 engine from an 03 Accord that I'm planning to turbocharge. I want to swap cams to the k24a2 cams for a VTEC killer setup. I'm planning on buying 4 more k24a4 rockers to grind down for the intake side. I've heard that because of the Accord pistons, you have to be careful with your VTC angles, but I wasn't able to get a clear answer on that. Along with that, are there any other things that would prevent me from doing this VTEC killer setup? Yes, I know every other head flows better, but I'm not trying to make any more than 350-400 crank horsepower. I'm just trying to work with what I have.

 

The TSX VTC gear is only a 25' wheel, so I think you will be fine with the limited swing over the Accord pistons... the question is have you considered how choppy the idle and low RPM operation will be ? Forget the crap you read about head flow... the Accord cylinder head has runners on both the Intake and Exhaust side that are more than capable of flowing the CFM necessary to make 400 WHP... especially under boost. The problem with the Accord cylinder head is the lack of pockets to install LMA's so that your "3-lobe" valvetrain doesn't beat itself to death when NOT in VTEC. What is it about the single rockers that you feel is requiring "grinding them down" ? Do the VTEC lobes of the TSX cams make contact with the rocker body on either side of the roller ?

 

I'm actually planning on putting the engine into a race boat, so a crappy isn't a big deal to me, and I like the sound of a big cam as well. I haven't purchased anything yet as far as rockers and cams, but from what I've seen, yes, the VTEC lobe that contacts the double rockers is wider than the rocker roller, so in order to prevent the cam from hitting the rocker body, you need to grind it away. I'm not sure what you mean about the single rockers. I've only seen people keep the double rockers on the exhaust side and buy 4 more double rockers to install on the intake side. If there is a better way to do it, I am totally open for suggestions.

 

I think we are talking about the same thing... a "Single" rocker assembly is a 1-Pc. device with a "Y" shape that reaches out to the top of both valves with an adjustable tappet and jam nut at each valve. They are stock on the Exhaust side of your Accord engine. This rocker design has a single roller in the middle of it which would make contact with the VTEC lobe of a 3-lobe style OE camshaft. The geometry is slightly different when using these "Exhaust" style 1-Pc. rockers on the Intake side of the engine, so sometimes you have to clearance the valley of the rocker arm around the roller face to clear the wider VTEC lobe on the Intake camshaft. Aftermarket camshafts, which are more aggressive, typically require that you clearance all eight rocker arms... or you pony up and buy aftermarket VTEC Killer rocker arms and no clearancing is necessary.

 

Just ran a compression test on the engine. Its reading 180, 80, 80 170... Well.... time to go for another engine. I'm still in my warranty from the junkyard, so I'll hopefully get a real vtec engine this time...