20 replies to this topic

[R.S.P]

Hi all been collecting parts for my engine rebuild for a while now to build a nice usable fun mini.

I have an idea of what sort of figure I am aiming for to Achieve this but what do you think it will make with the bits I have gathered below.


Thanks in advance Darren



Swift tune SW5-07 camshaft
Swift tune Alloy vernier duplex chain
Hypatec 73 mm pistons
MED 81.3 mm reground, Ni- Temp, Wedged & X-Drilled Crank
Balanced A+ Rods with ARP Bolts
Pierce manifolds Standard Alloy 7 Port Cylinder head
Twin 40 Weber’s
Megajolt
Minis spares ultra light billet flywheel
Minis spares ultra light billet back plate
AP racing clutch plate
Orange diaphragm
Minis pares 4 pin diff
Centre oil pickup
Vandervell bearings
Maniflow stage 2 lcb
rc 40 exhaust twin box
All above have had full rotational balance

[danrock101]

I don't know a load about crossflow heads but I wouldn't of thought a great deal over 100bhp with the SW5 cam, you'd be better off with atleast a 286, I'd personaly use a kent 296 SP then you'd be looking at 130-140bhp possibly more

[JakeJakeJake]

Roughly 140bhp and about 100 torques, would be my guess

[wmc1]

I don't know a load about crossflow heads but I wouldn't of thought a great deal over 100bhp with the SW5 cam, you'd be better off with atleast a 286, I'd personaly use a kent 296 SP then you'd be looking at 130-140bhp possibly more

I would have to agree if the figure your aiming for is 100bhp or just over, but if you were expecting more your need to run a bigger cam like the ones suggested.

[Paul Wiginton]

120 if you fit a 286 or sw10 instead of sw5

Paul

[summs116]

ive got that 7 port head with 37.5 inlets 31 exhaust valves,ported out alot and 21 cc
1380cc with the 296 cam
belt drive kit
twin 45s
aldon red dizzy
centre strapped,steel crank and rods
migla manifold
med ld roller rockers

139.8 bhp @7400
108 ft tourque

rolling roaded at slarks

its very drivable compared to a full race 5port,

[R.S.P]

Hi gents Thanks for the replies my aim was for a real 100bhp not pub talk, I went for the sw5 as I wanted a car that would still drive like a standard 1275 around the town I did consider the sw10 and 296 but did not want an engine that I would have to rev to get it to go.




summs116- whats your like at low rpm? and where did you get your head done mine is just as it came form pierce idea was to run it as standard for m and when I want more power get it modded then.


Thanks Darren

[minicb]

we're about to fit a MED trackday/hillclimb 7 Port head, twin 45 webers and dry deck to a 1293 block. full MED straight cut gearbox, 286 kent cam, steel X-Lite flywheel, paddle clutch, steel billet crankshaft, steel conrods, omega pistons, steel pushrods, aldon red dizzy
ect ect the list go's on and on lol

my mate is mad as the engine has already cost him over £6000 and the engine has been out 3 times lol

Edited by minicb, 30 December 2010 - 02:16 PM.

[E.L.M.O]

I hear the SW10 is meant to be good for drive-ability?

[starletman]

I don't know a load about crossflow heads but I wouldn't of thought a great deal over 100bhp with the SW5 cam, you'd be better off with atleast a 286, I'd personaly use a kent 296 SP then you'd be looking at 130-140bhp possibly more

Are you suggesting that a cam can add a 40% all on its own.

[R.S.P]

when I got the cam I looked on the swift web site which said you would get about 10bhp more out of a sw10 over a sw5 but the real power on a sw10 was from 5000rpm so I decide this was not the cam for me with it being a road car.

The sw5 according to swifts web site will produce more power than a 286 up 5500rpm and as its a road car this is why I plumped for this.


Also missed from the spec list got 1.5 roller tip rockers

Edited by R.S.P, 30 December 2010 - 04:14 PM.

[Racer_Pete]

If you fit a sw5 to that kind of spec i think you would regret it, a sw5 is still only tame in a 850/998 5port.

[summs116]

Hi gents Thanks for the replies my aim was for a real 100bhp not pub talk, I went for the sw5 as I wanted a car that would still drive like a standard 1275 around the town I did consider the sw10 and 296 but did not want an engine that I would have to rev to get it to go.




summs116- whats your like at low rpm? and where did you get your head done mine is just as it came form pierce idea was to run it as standard for m and when I want more power get it modded then.


Thanks Darren

Slarks done the porting and dry decking,i had it mildly ported at 1st and it pulled from 2700 nicely and could drive it round town but was only making 118bhp,so i had it ported out and alot more done,now it 3400 upto 7500rpm,the only problem is that the ports are very big and with the 45s its lost the lower end tourque and it stalls if you come to a fast stop at a juction somtimes,maybe its down to the grey clutch cover and ultra light flywheel,but i built it 4 trackdays so not so worried,i would run 40s and run it as it is and it should b a good drivable 100-115bhp,but is all down to who rollers and sets it up,

[danrock101]

I don't know a load about crossflow heads but I wouldn't of thought a great deal over 100bhp with the SW5 cam, you'd be better off with atleast a 286, I'd personaly use a kent 296 SP then you'd be looking at 130-140bhp possibly more

Are you suggesting that a cam can add a 40% all on its own.

Not at all, the engine may be capable of 130-140bhp but the sw5 wont rev high enough to produce it.
I've seen plenty of engines with 286 duration cams only make just of 70bhp then sw5 engines make over 100.

Edited by danrock101, 30 December 2010 - 05:44 PM.

[R.S.P]

Thanks for the feedback gents now dont know what to do.

what sort of cams are people running and what sort of rev range are they usable at?