Have a 95mm stroke B series with LS length Rod. made only 196whp. Could the rod to crank of 1.44 had to do with it?? its with PNP pr3 head, CTR IM 76mm TB,ANR Header, custom Arias piston 13.5:1CR. My tuner believe its the bad R2C ratio causes this. Any thought?

 

I dont think thats holding you back. Im sure someone with more experience will help more.

I think you need a different tuner and a different header.

 

What kind of cams do you have?

 

Aren't you supposed to have a custom rod with a 95mm stroke, one that complements the piston, the wrist pin would sit higher in the piston. I've never heard of a ls length rod in a stroker build. who built your engine and why wouldn't they advise you on it?

 

What fuel? What bore? What cams? What engine management?

 

wtf.

If you're using a standard LS rod on a 95MM crank, then you'd be in the hole, I believe..

I don't think that's right, What cams, and fuel, sounds as if something is very wrong with this setup.. as in, it was just thrown together and hoping for some radical numbers.

 

Not the rod to crank angle. A number of things could be your issue

Maybe vtec isn't activating
Cam timing could be off
You may have leaking valves
etc...

You should also check the motor, do a compression and leak down test.

 

i believe he's able to use the LS rod because of the custom arias pistons.

O.P. ..

- what RPM did you rev it to?
- what was the TQ and where did it drop?
- what cams?
- what fuel and ignition timing?
- what kind of dyno?

those questions need to be answered before verifying the engine's health.

 

Correct you move the pin toward the piston crown 1/2mm for every 1mm of stroke you increase. This keeps the R/S ratio sane but can cause issues with oil control ring seal if not done properly. While you 196 isn't fantastic, you have not mentioned what cams you are running like someone else already said. With B16/GSR cams this is not unrealistic. Is it possible that your Vtec is not engaging? To be further assisted you will need to also post a dyno sheet.

 

Sounds to me like VTEC not engaging. Oil Pressure during the runs ? Post a Graph if possible, What cams btw ?

 

Sorry for the delay in replying. Im at the flipside of the world. Ok.i can only post graph on Monday.
Im using skunk2 pro3. Its not standard LS rod but its LS length BME AL rod and raised compression height Arias piston of 85mm. I build the motor myself where all clearances have check and cams are degreed to cam spec. I have buit quite a few b series like the b20vtec that made 219whp, 222whp and 230whp.
I bought the pistons and rod combo via Matt @Speedfactory after consulting with him the block I use which is a gsr block and 95mm b series crank. When it was tuned it had 97ron pump gas. I used ID725 and bosch 044 pump. On hondata s300. The vtec was there.
I don't remember the tq but it was somewhere 210nm and the graph start to drop past 7k rpm.
Im thinking if my stock CTR IM had to do with it.

 

Around 9k rpm
Dont remember what tq but its somewhere 210m.it drop past 7k rpm
Skunk2 pro3
97ron pump gas..16
Dynojet 2wd

 

From your recent details it appears as if vtec is not functioning.

Pull the solenoid from the engine and check that the screen on the gasket is not full of debris.
Typically what I do next is run 12v to the solenoid to make sure that it is functioning with the car off, the solenoid will click. With the car on you can have someone hold he RPM above 3k RPM (to provide additional oil flow) touch your 12v to the solenoid plug to make sure the vtec system is functioning. You should hear an audible change and the car will likely bog.

 

Cams degreed..?

 

Ok..I will do that on Monday. But we did hear an audible vtec engaged during the dyno run. But I will do whatyou said to make sure.

 

Yes..to cams spec sheet.

 

BC has LS length rod with 95mm crank stroke.

 

If oil Pressure is barely sufficient for vtec to engage, It will engage-disengage immediately, I think i've seen this happen to someone in this forum dont remeber atm.

 

Sounds like it's running on the primary lobes only. makes sense for the pro3s to drop off around there. I made 210whp with pro3s with Vtec disabled. Pro3s' Vtec lobe should carry to 8000rpm+

 

Dyno graph available?

 

I hope that's the case.

Not at the moment, im out of the country for the weekend.will get the dyno graph as soon as I get back.

I have a fairly new oil pump which was used once on a dyno but stock unmodified pump. How did he solved it?

 

If it is an oil pressure related issue it may not be caused by the pump itself...

 

If i remember correctly it was caused by missing dowel on the oil passages on the cam caps, Could be wrong though its been more than a year old topic.

 

I remember installing the dowel and the o ring. May be faulty solenoid?

 

What else could it be? I blocked off the squirters.