Planning a new 2165cc for my 67, some camshaft ideas
Jim Ratto:
have you already purchased 1.4/1.5 ratio rockers?
DaveN:
Quote from: WhiteTrash on November 22, 2019, 09:59:45 am
Quote from: DaveN on November 21, 2019, 18:33:33 pm
Quote from: alex d on November 21, 2019, 16:33:55 pm
Some pictures of the heads for reference
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How many years did you have to wait for them ::)
He didn't have to wait long at all. Jeff just sold him somebody elses heads who'd already paid in full, waited 5 years and has given up on them. ;D :D ;D
:D
I would us a FK 8 if it was mine. I have one in my low compression 2276, it drives nice on the road and still ran a 13.2 with the turbo gear ratios that are in the gearbox
alex d:
Quote from: Jim Ratto on November 22, 2019, 17:33:18 pm
have you already purchased 1.4/1.5 ratio rockers?
not yet, but i was planning to. I dont find stock rockers really cost effective, by the time you get bolt on shafts shimmed properly, stands ground and swivel feet adjusters you have spent almost as much as a set of scat or cb 1.4s
Jim Ratto:
Quote from: alex d on November 22, 2019, 21:25:09 pm
Quote from: Jim Ratto on November 22, 2019, 17:33:18 pm
have you already purchased 1.4/1.5 ratio rockers?
not yet, but i was planning to. I dont find stock rockers really cost effective, by the time you get bolt on shafts shimmed properly, stands ground and swivel feet adjusters you have spent almost as much as a set of scat or cb 1.4s
Hear me out....
I recently went to the CB2300 cam in my 94 x 84 I've been planning and building for some time. It's been on the street since mid-June.
I'm running it with Scat 1.25 rockers, which dial in closer to 1.3. I can share actual lift @ valves, if you want, I can go find the build sheets for this motor. It came out around 0.560" with the real springs (using light checking springs will give you a false 0.020-0.030" more).
I am running a 5.352" Carrillo on this Okrasa 912 journal crank- with ports and valve sizes very similar to yours. The heads were down with air-speed as concern # 1, and flow 199cfm @ 0.570" @ 28" with manifolds on. Compression is set to 9.8:1.
I did have the lifter bores bushed, as the ramps and lift at the lobe of this cam are getting on the very aggressive side.
The engine runs unlike any other I've had in my car in the last 33 years. Under 2800 rpm it is a little bitchy, above 3000 no problem accepting throttle, above 4000 it's extremely urgent ride to 7200. My exhaust system at the moment is undersized and will be dealt with in the near future. I don't drag race my car, I use it as a regular driver. I run 4.375:1 x stock, with 195/65 and car is content turning 3800-4200 on freeway, willing to blow by anything it needs to pass. Still amazed with the lack of drama with this setup, valvetrain is quiet, oil temperature on 95F day, making climb eastward through eastern Ventura County to LA County from Conejo grade never touched 180F. I run 42mm venturies, was surprised how much jet this engine needed to "come alive", which leads to the one downside so far with this new set up- fuel mileage is much worse, recent trip to Costa Mesa and back from Simi at normal highway speeds was 14.6 mpg.
The CB2300 is one cam I would consider ,based on what it seems like you're looking for. I was advised not to run it with full blown 1.4 for my purposes (lift at lobe is 0.430"), which I agreed with and used a set of brand new Scat "1.25" I had stashed. I think the 1.4 are going to be overkill on street with this profile.
Your motor will probably run a little hairier since shorter stroke/longer rod/less cc if you run this cam. Advancing intake lobe center 4 degrees will tame that some.
Have fun.
Jim
alex d:
Thanks for your input Jim! .430 lift at lobe seems like a little much, even with the 1.25 rockers, I'm guessing you get around .560 at the valve? Which springs are you running? I'm trying to stay away from CB650s and the like
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