I wanted to see if anybody has a dyno sheet of Blox type c cams on either a stock gsr or b16 motor. I had my cams sent to Blox because they were not producing any power before vtec compared to stock b16 cams. This is what I got from Blox when I sent my cams to them.
This is my engine set up:

Gsr block 82.00 bore
ls crank, eagle rods, nippon b16 pistons
B16a head with blox spring and retainers
rc 440 cc injectors, walbro 255
Blox type c cams
new oem valves and bronze guides
type r intake, 68 mm tb
dc header 4-2-1
exhuast is 2.5 back
exeady stage 1 clutch
exeady 10 lb flywheel

This is what they said:

Thank you for your patience while we conducted our warranty inspection of your camshafts. Our technician has completed the inspection. You camshafts have been measured against multiple sets in house as well as our production measurements. The cams are in fact our Type C profiles based on these measurements. The only conclusion that would explain your tuning issues with the engine setup is a lack of air flow for the engine, and it’s choking out after the Vtec crossover. Has your head been ported? If so, how much was it ported?

The stock ports are creating a bottleneck in your engine setup. With your increased compression and with the larger profiles of these camshafts, the engine will need larger ports to let it breathe. Your stock B16 cams share the same primary lobes as the ones on our Type C’s, which is why the performance isn’t affected before the Vtec crossover. Once the crossover occurs, the size of the Vtec lobes make a huge difference. The B16 lobes are much smaller and have slower ramp rates than the ones on the Type C’s. With the increased ramp rates and lift of the Type C’s, the engine is trying to pull more air at a faster rate into the compression chamber. With the small ports, the engine can’t flow enough air at a fast enough rate, causing it to choke out. It would be like you trying to run a mile as fast as you can but only breathing through a straw.



The rest of your engine setup should be sufficient to flow enough air into and exiting the engine to make good power. I would recommend contacting a reputable company like Port Flow Design that can perform their services based on the specific needs of your engine build, rather than having a shop port it without taking all the elements into consideration. The engine should make good power once you free up the air flow. We’ll process the shipment of your cams to the new address you supplied below. Please let us know if you have any other questions.

Thank you for your understanding. My personal opinion, these cams are perfect for your setup, with the exception of the stock ports. I think you’ll be happy with the results once you open up the ports on the head and see their true potential. It is very likely that any camshaft upgrade, outside of factory cams, will suffer the same results unfortunately. If you have any other questions or suggestions for your build, feel free to contact us at 510-440-1605, or email me direct at nick@bloxracing.com. We’ll be happy to help you out with.

 

Just search JunIII dynos, they are literally the same cams, verified by DonF and Mikey.

https://honda-tech.com/forums/showpo...6&postcount=12

 

I have been looking for them on stock motor. Just wanting to prove a point that you dont need a ported head in order to gain power from the type c or JunIII over stock cams.

 

did you ever do a leak down test on the motor? i had something very similar happen to me, but it ended up being the bottom end and not my cams.

 

Yes I did, did a compression check, this is the point, lets say my block was bad. i run the blox type c cams and before vtec I hit 111 hp. After vtec I think it was 134. I take those cams out and put stock b16 cams in. Before vtec I hit 137 and then 159 with vtec. This is the point im trying to get across is if the primary lobs according to blox are the same, why did the stock b16 cams make more power before vtec?

 

Installed wrong?

 

Thats kinda the results of having no idea where the cams are set. It looks to be more of mechanical issue to me than the cams being the problem, just my 2 cents. For sure the head doesn't need to be ported to use any set of cams.

 

Lol set at 0,0 with theright valve lash.

 

So question, if it was mechanical then why would the stock cams b16 the lowest of all the cams for vtec produces more hp out of vtec. Blox type c have the same primaries as stock cams. Maybe i need to stop building engines because I'm lost here lol. I have had itr cams, I have had endyne Bumpstix cams and made power but this one type of cam I guess I just can get right lol. So I can understand can somebody explain this to me.

 

Why did you make another thread dude? This is literally the same thing as your other one. If you want dynos, look through the dyno thread.

 

What cam gears and crank pulley are you using? And personally i am not too fond of blox valvetrain

 

And a compression test is not the same as a leak down test... do a leak down test

 

Mods just close this thread
Please

 

Blox exceeded my expectations as far as how they handled this situation. good customer service. not sure what else you want them to do. Why dont you ask if they can keep your C's , and have them send the A's to you?

 

UPDATE FROM BLOX:

John-



Thank you for your in-depth response. This would be the first time we’ve heard of an issue with the base circle of our camshafts being off in the last 10 years of producing camshafts. All of our camshafts are cast from the same molds depending on Tuner Series or Competition Series. I have escalated your concerns and discussed this matter with our owner. While we have not encountered this issue before, we would like to send you a brand new set of camshafts to retest in your engine build. We would like for you to provide us with the results for our own technical database. Please let me know if this will be an agreeable resolution so we can process the shipment as soon as possible.





Blox Racing Warranty Department