It is currently December 8th, 2019, 2:23 am
cornor wrote:
Will there be a issue with solid cams and wear due to modern oil without zinc additives ?
Regards
Pal
cornor wrote:Thank for your all good inputs Rick and Grumpy, much appreciated.
I have used some hours this weekend looking through Ricks thread about his engine
building, and I must say it is very impressive and packed with good information for
someone like myself trying to put together a engine without a lot of experience and
knowledge. I think I will need to use the thread as a guideline and reference for my
engine built up. From what I could see and understand you are happy with the cam
selection and the car and I will consider using the same for my engine.
cornor wrote:Hello again, while I am waiting for the block to be checked and hopefully be confirmed
OK I am looking into the cam selection.
Even stock bore blocks can have marginal cylinder wall thickenss, when exceeding
500 HP in a SBC. Look at my numbers and subtract .030 inches from the numbers
and you will see what I refer to.
I think I would like to go for the hydraulic roller Crower 00471 cam recommended,
and which I understand is the same that Rick have in his engine. From what I can
calculate and see this will give me around 8 in dynamic compression as per Grumpys
recommendation, and a overlap of 69deg. which should be OK for a
hot street engine if I have this correctly.
Pal ….. please post the numbers you are using for your Dynamic Compression Ratio (DCR)
and be specific and detailed.
Yes the Crower has 69 degrees of overlap, that’s ground into the camshaft and can’t
be changed during installation. Only a new camshaft will change overlap.
It’s easy if you are close to the correct DCR to tweak it by adjusting the Intake Valve
Closing (IVC) angle. Check out the differences below in the graphic. Keep in mind that
you are giving up about 200-300 RPM in the low rpm torque. I wish now that I had used
the 2 degree retarded position, numbers in the yellow middle column. Keep in mind
that the gas I'm using is 91 octane [(R+M)/2], that's the best available pump gas here
in Oklahoma, USA.
viewtopic.php?f=99&t=4458
Yes I'm using the Crower 00471 Crower and I love it, but I only weigh about 1800 lbs
and using an 200-4R automatic trans, but you have the M22 manual trans and clutch
that will compensate for the heavier car. I also have a very tall tire at 31 inches. I
went from 28 to 31 and that pretty much like going from 3.7 to a 3.5 rear gear ratio.
Not making a big point above, but it is background that applies to this post and our
situations being compared.
Will my 1.6 roller rockers (PEP) work OK with this set up or should I aim for something
else ?
Should work fine, but you will need to measure your “valve to piston clearance”. That’s
true not matter what camshaft you run. Not sure what size rocker studs you are running,
but 3/8 inch will definitely benefit from a girdle. Hopefully you have 7/16 inch studs,
again a girdle can’t hurt. I’m using 7/16 studs and no girdle, time will tell. I don’t expect
them to break, but there is more to it that NOT breaking, it’s called better valve train
control. Money sometimes dictates the decision.
Rick how is your experience with this cam in your engine, now after you have driven it
for a while ?. I see that you are doing a lot of tuning and work with your carb now, but
I assume you have been driving the car also, I saw the videos from the drag race, and
that was nice.![]()
No better way to explain than an example. Some guy was taking pictures of my car at
the stoplight, I was in the turn lane. The turn lane leaves first here, so I blipped the throttle
(@1800 RPM) about 15 feet into the turn and the back of the car raised, the tires break
loose momentarily and then it settles to make the turn. Do I like this camshaft …..
HELLLLLL YESSSSS!!!!
Would a dual plane intake as the airgap RPM be a good choice on my engine ?
Yes it’s going to be your best option for your situation. Now if you were street racing for
money and ¼ miles times were in the 10’s, then a single plane might be in your future with
a higher revving camshaft. The only thing that matters is winning the race and getting to
work doesn’t matter or doesn’t apply.
I will keep you posted when I have more info. It will take some time to get the needed parts
from US. Even with airfreight which can be used for not too heavy parts, it will take around
2 weeks to get parts. We have some decent US car part shops here, but if you shall have
something a bit special, you will need to get it from US.
Keep in mind that there are different materials that you can purchase when buying a
camshaft. So every camshaft has several versions of the same grind, just difference
materials and different distributor gears. You will have to make sure that the cam gear
and distributor gear are compatible or it will ruin the cam gear and therefore the camshaft.
Grumpy will be able to post some good info for you or just do some research here.
Regards
Pal
philly wrote:the queen of england may be old, but like all older ladies she still has her secret ways
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