Exotic camshaft query, big bugger, thoughts? Who has played?

[dat2kman]

Just a little query,

Camshaft figures of

80 -50 ,50 - 80, total duration of 310 deg, duration at 50 thou is 246 deg

Lift at valve 0.597

 

In Nismo parlance this is pretty up there for a SOHC engine, not for road use, obviously!

 

Who has played up around these numbers

 

PeterMc will have been around this, your thoughts?

 

 

[NZeder]

I think Tony D on hybridz.org might have played with a large cam like that on the saltlake car.....nothing below 3000rpm.

[d3c0y]

It depends a lot what it has been ground on as to whether it will be any good at that lift.

From what I have been told , these big lift cams generally have issues with the lobes being soft.

 

 

I would love one that spec for my engine, but the issue above and the fact it will wear the guides pretty hard has deterred me.

[Xnke]

I have a 308* cam with opening/closing numbers close to yours, duration at fifty is slightly less at 242*, lift is 0.588" The cam was cut on a Japan hex-lug core a long time back, and I don't have a manufacturer, nor any kind of marking on the cam at all. it shows very little wear on it, but I don't have the brass ones to chuck it in the Z and drive it in traffic. I've REALLY thought about it, though, but for now it's greased and wrapped up in the box my Isky custom cut came in, till I figure out what to do with it. I have thought about sending it in and getting it profiled just in case, but haven't done it yet.

[260DET]

0.597" valve lift is huge, compared with the JWT high lift S2 cams I got for the VG33ET anyway. They give 0.473".

[Riceburner]

Here's the spec sheet I got with my wade 76 high lift. I don't know what any of the numbers mean  Haha. IIRC Pete MC said the lift is more like 580? Something to do with the way they measure them.

[dat2kman]

Just wondering if anyone has run a big bugger!

In a six cylinder!

And what results.

 

I've been running one of these in a four cylinder engine, head is FIA Datsun option jobbie.

No good under 3500 though!

Intake valves are largish at 50mm diam. Carbs are 50 mm.

No issues on lobe or rockers, but geometry is FIA, not L series setup, must be slight differences.

 

[peter mc]

its not a good race cam  at 50 is way short , slow at 50 just means It will rpm but wont make power , the 654a has 264 at 50 and has 550 lift and 314 deg , power come in at 4000 and goes to 7500 on a 2.8, on 3.4 and 3.2  power is from 3800 to 7500 .

 

we have a new cam that runs 620lift and 315deg 274 at 50 , this cam needs 12.5 comp and cubes power from 4 to 8500

[d3c0y]

So my motor wont run that cam with 11:1?

 

 

How hard is that thing on the guides?

[dat2kman]

I'm making 245 hp at 7700 and 191 ft/lb at 6000

Capacity a bit over 2 litre,  four cylinder,

on a Heenan/Froude old type engine dyno

( same as Moorabbin?)

 

On a hp/torque per cylinder basis, that cam compared to a few others tried, gave best results.

 

U20 engined car. The red one.

[peter mc]

hey dat2kman the only way you will get more is with a turbo lol your at the top end now , cams will not make much more now

[d3c0y]

Mine is 355hp at 7400 and 298 ft/lbs from memory at 5200rpm thats with the wade 76 high lift above.

106hp/L on pump 98

3.35L six cylinder on a superflow engine dyno

 

 

 

 

Jason that means your is doing 122.5hp/L how much over 2.0L is it exactly??