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What Camshaft For Maximum Power For A Weekend Warrior 1380?


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#1 Racer_Pete

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Posted 13 September 2019 - 07:45 PM

Hi guys, I dont think anyone has asked this before so thought id ask, i currently am running a kent 296 cam in my a+ 1380cc rear wheel drive Morris Ital van, the van will be used on sunny weekends and a 1/4 mile blast at santa pod, i know most people will say "a 296 is more than enough" but i want to go even more mad... the 296 to me is fine to drive to me, Im running a 4.1 final drive with 3J LSD and the van weighs around 750kg at a guess, it is stripped out with various lightend parts but havent had it weighed. My question is what is the cam to go for? The obvious choice would be a kent 310 scatter, but there have been many new cams made since then. Ive looked at swiftunes sw23 and sw310, im guessing the sw23 is more used for historic race regulations and the sw310-SPT is the full bells and whistles cam? But is there a real diffrence between that and a kent 310.. apart from the price..

The only problem i have is that i am using twin hs4's as using a Weber 45 with a decent 6" manifold there just isnt enough room to fit as it will hit on the Ital, i know the 310 is more designed for a Weber for maximum power. I wont loose any sleep missing out on 5bhp or so by not having a Weber but i do know that the twin hs4s are only adequate for about 125bhp? Twin hif6's can get up to 135? Added my engine spec below,

Views and thoughts would be appreciated, thanks pete.

1380cc, Block drilled for 11 studs
OMEGA forged 73.5 pistons
Race spec head, unknown origin 29x37
Kent 296 Camshaft
Swiftune alloy/alloy Duplex
MED 1.3:1 Roller Rockers
Maniflow Stage 2 Full Exhaust System, Heat wrapped manifold
Keith Calver race spec electronic dizzy
Crank - Wedged, bladed & crossdrilled
Rods - Lightened & Polished
Rotating assembly balanced
Isky Type Lightend Followers
Twin HS4 Carbs
Maniflow Steel Inlet
ITG S/S Filter
ARP Conrod bolts + Head studs
Lightend dizzy drive
Eletric fan, mechanical removed
Facet pump
Shell VPower
Millers CTV oil
C/R 12.5:1


Differential -
4.1 Final drive
3J LSD.

Attached Files


Edited by Racer_Pete, 13 September 2019 - 08:08 PM.


#2 imack

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Posted 13 September 2019 - 08:08 PM

Great to see someone else enjoying running a race cam on the road.
I'm running a very similar spec road engine using MED'S fia15 historic race cam, 1.5:1 rockers and their 37/31 offset valve head, great fun on the road.
Have you Vizarded the carbs fo a little more flow?
Why 1.3:1 rockers? I thought the 296 was designed for 1.5's.
No experience of 300+ degree cams but I thought Vizard didn't find they produced much more top end than a 649 type cam and lost power lower down. Those books are old now though and perhaps cams have moved on.

#3 unburntfuelinthemorning

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Posted 14 September 2019 - 07:08 AM

You might get a Weber IDA carb in there.

 

That's a wonderful van, especially with the livery and ladder on the roof.



#4 DeadSquare

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Posted 14 September 2019 - 07:58 AM

If you chopped a bit out of one side and welded it in the other side if the engine mounting, and put a cank in the gear stick, you might lean the engine over enough to fit a Webber...............

...................                                                                                                                                                                                                                                                           .............

Or even a supercharger.



#5 mini13

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Posted 14 September 2019 - 08:07 AM

Sw23? Or a vp4? Maybe even a vp5, but once your pushing 300 degrees your inlet, head and exhaust flow need to be up to par to make the most from it, and also you'll need plenty of compression ratio as the dcr will be taking a dive

#6 DeadSquare

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Posted 14 September 2019 - 08:39 AM

"A 1/4 mile blast at Santa Pod"...........requires torque..............to accelerate a vehicle.

 

The cams that are being suggested are not made to do that;  they are made to be used at full chat, to give a car that used to have a top speed of say 100 MPH at 7,000rpm,  a bit more power to push it up to 110 MPH at 7,750rpm.

 

You need a cam that gives you power long before 7,000rpm, and cams don't make that kind of grunt, but cubic inches do, and the only way to make a small engine pretend that it is bigger, is to supercharge it.


Edited by DeadSquare, 14 September 2019 - 09:07 AM.


#7 nicklouse

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Posted 14 September 2019 - 11:17 AM

As above torque is what you need.

What rpm does the engine currently hit?

#8 Orange-Phantom

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Posted 14 September 2019 - 03:31 PM

My brother runs a Kent 296SP cam on his hillcliber and is producing 134 bhp the last time he had it rolling roaded.  He beats people who use wilder cams than this and I would put that down to having more usuable power lower down so more may not be better.  But hey it's your car so if you fancy going a bit nut's, why not, give it a go, you can always go back.

 

I'm just wondering if there is enough room for a 7 port head....

 

Nice van by the way!



#9 A-Cell

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Posted 14 September 2019 - 05:10 PM

ITAL go better with an Ausralian Leyland Marina (code YDO25)
Six-cylinder 2.6-litre overhead cam, E-Series engine.
The power output was 121 bhp (90 kW) and torque 165 lb⋅ft (224 N⋅m).




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