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 Post subject: rpm range
PostPosted: Fri May 20, 2005 1:16 pm 
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Posts: 79
Can anybody tell me what the rpm range of this cam is?

.530 valve lift

306adv duration

264@.050duration

51/75 intake

75/51 exhaust

.010 cold lash


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 Post subject:
PostPosted: Fri May 20, 2005 1:20 pm 
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Location: Melbourne, Vic
High.

I'd say it'll come on somewhere between 3500-4000 and make power through to 8000-8500.


Dave

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AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
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PostPosted: Fri May 20, 2005 2:36 pm 
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High to you too, Dave :wink:

Just make sure the rest of the engine's built to suit the cam, ie porting, carburation, exhaust, etc (and a little balancing won't hurt, either)

Putting that cam onto an otherwise stock motor won't achieve a lot.


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 Post subject:
PostPosted: Fri May 20, 2005 3:08 pm 
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Well we are in the planning stages of building our 1800. We have twin 45's on it now, headers and exhaust straight out under the passengers front door.

From what little knowledge we have we are going to use the std internals, which we believe will go to 7500-8000rpms with ARP bolts, balanced flywheel, clutch etc(but I stand corrected)

High comp ratio is not a concern for us , as the car is track only. We are thinking of 11.1 plus to go with a cam around the 4000-8000 rpms max.

We have yet to work out our diff ratio etc but the above is where we are heading.


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 Post subject:
PostPosted: Fri May 20, 2005 3:29 pm 
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Location: Melbourne, Vic
Cam sounds good for 4000-8000 to me (read: I have exactly no experience here, just going by what I've heard from others).

Fully balanced rotating assembly (balancer, crank, rods, pistons, flywheel, clutch) would be a good thing.

What CR you want to run is mostly dependent on the fuel you want to use.

Dave

_________________
USA Daily: 2014 Nissan GT-R, very minor modifications for the track
USA Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. SOLD


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 Post subject:
PostPosted: Fri May 20, 2005 4:26 pm 
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Location: Lonsdale, South Australia
with L18 max torque about 5800,
max HP around 7600.
will rev a lot harder tho.
big chokes needed

_________________
A little knowledge is a dangerous thing.
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"R.I.P. Baz. 29 April 2022. Thank you for all your contributions to the Datsun community over the years. You will be missed." - OZDAT


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 Post subject:
PostPosted: Fri May 20, 2005 5:07 pm 
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Baz wrote:
with L18 max torque about 5800,
max HP around 7600.
will rev a lot harder tho.
big chokes needed
What size chokes in what size carbs?

Are my 45's big enough for 7600rpms?


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 Post subject:
PostPosted: Fri May 20, 2005 5:09 pm 
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Location: Melbourne, Vic
45s with 42 chokes maybe? Or maybe just run them with no chokes. :D :roll:

Dave

_________________
USA Daily: 2014 Nissan GT-R, very minor modifications for the track
USA Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. SOLD


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 Post subject:
PostPosted: Fri May 20, 2005 5:10 pm 
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Posts: 992
Location: Adelaide...On the Road again !
kkk289 wrote:
Baz wrote:
with L18 max torque about 5800,
max HP around 7600.
will rev a lot harder tho.
big chokes needed
What size chokes in what size carbs?

Are my 45's big enough for 7600rpms?
That would depend on the chokes!

_________________
1975 P610/180B SSS ex PRC3 Rally car (parts car)
1974 P610/180B SSS (parts car)
1972 P510/1600 Currently sitting untouched
1977 P610/180B Wagon Daily Driver


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 Post subject:
PostPosted: Fri May 20, 2005 6:23 pm 
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Posts: 71
Location: Melbourne - Eastern suburbs
I've looked at this website a few times when I've been wondering about suitability of carbies. http://members.aol.com/dvandrews/webers.htm
Its pretty cool, takes you thru selection of all your chokes, jets, aux venturi's etc.
There's also a site, almost exactly the same dealing with Dellorto DHLA's - http://members.aol.com/dvandrews/dellorto.htm. Originally put together for Clubman owners in the UK, but the info is all non-engine specific.


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 Post subject:
PostPosted: Fri May 20, 2005 6:28 pm 
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Joined: Fri Oct 03, 2003 2:48 am
Posts: 2179
Location: Melbourne, Vic
Nice post Komic, mind adding it to the datsun related links thread in FAQ?

Dave

_________________
USA Daily: 2014 Nissan GT-R, very minor modifications for the track
USA Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. SOLD
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. SOLD


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 Post subject: Re: rpm range
PostPosted: Sat May 21, 2005 12:57 am 
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Joined: Mon Mar 17, 2003 3:22 pm
Posts: 235
Location: Brisbane
kkk289 wrote:
Can anybody tell me what the rpm range of this cam is?

.530 valve lift

306adv duration

264@.050duration

51/75 intake

75/51 exhaust

.010 cold lash
its rev range will be about as long as this piece of string...

depends on so many other factors, but mainly the quality of headwork (and the components used), CR, rod length, carbs, headers etc...

45's can only go up to 40mm chokes - not big enough for what Baz suggested as the optimum result IMHO


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 Post subject:
PostPosted: Sat May 21, 2005 11:11 am 
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Joined: Tue Mar 04, 2003 10:09 am
Posts: 2596
Location: Lonsdale, South Australia
kkk289 wrote:
Baz wrote:
with L18 max torque about 5800,
max HP around 7600.
will rev a lot harder tho.
big chokes needed
What size chokes in what size carbs?

48s with 42 chokes minimum for full race.

Are my 45's big enough for 7600rpms?
45s with 38s would pass but would go down to a 76 cam & then still a compromise.
50s would be nice.
but if you dont have the gear ratios to suit then you are better off with a milder cam & 38 chokes.
As L18_B110 stated, this all depends on the rest of the build, especially the cylinder head.

_________________
A little knowledge is a dangerous thing.
www.datsport.com

"R.I.P. Baz. 29 April 2022. Thank you for all your contributions to the Datsun community over the years. You will be missed." - OZDAT


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