30 replies to this topic

[cradley-heathen]

ok, so having resigned myself to the fact that my current engine sadly isnt as i good as i hoped it was, i have clicked buy it now on some gear on ebay (just waiting to hear from the guy now)

i have got/will be getting

1380 Engine Kit

AE Powermax 20659KR 73.5mm pistons

1275 A Series crank 12G1505 EN16 Tuftrided ground 10 / 10

A+ Rods

Glacier Vandervell bearings VPR91306 + 0.010"

my mate has a standard 1275 short engine i can have for the block, and i will probably use the same company to do the machining as i have used in the past. i also have a choice of 2 similar "stage 3" heads, one of which is as new.

my question is, what cam do you think i should use? my brother used this same spec with a 276 cam and 1.5 roller rockers to good results. and i could be tempted to go the same way as i have a set of the same rockers already.

or would i be better getting a 286 and using standard rockers (plus i can sell the rockers to off set the cost)

or what cam do you lot recomend?

the car is used daily, but i only travel a very short distance to work, and dont have to sit in much traffic. however i am a spirited driver, and will be using the car for as many track days as i can fit in.

[Jordie]

i was looking at that bit of kit too

i used a morspeed PH3 in my last one, it seemed ok with good power. wasnt too lumpy etc.

used a 286 in a 1330 too and that was good, bigger CC seems to iron out the lumpiness abit.

[benspickup2011]

286 or try swiftune's sw10. That's the cam I've got in my 1310, not really bad low down and pulls well up to my limit of 7k. I've got standard rockers though!

[ACDodd]

This is a good question and the right on to ask before you buy/build, how many miles do you want the engine to last?, Any Emission limits, Idle quality, and what rev range do you drive in? Daily driver? Traffic etc?

Oh and for the record, consider an offset bored 1330 engine, this way you still have 1360 and 1380 left on further rebuilds.

AC

Edited by ACDodd, 18 March 2012 - 08:27 PM.

[AndyMiniMad.]

My 1380 runs well with a Calver ST....RE 13 OT cam....nice power from 2500 and pulls well all the way to peak power at 6400...it seems to have a second "on cam" stage at around 5800 to peak...but that may be just the scavenging effect at higher revs..

My mates 1380 rally car has a Med rally cam and is not nice as a road car, but goes well from 3500...I would guess its a 310 profile but am not really sure..

Oh, and I also think 1330 is a good choice...

Edited by AndyMiniMad., 18 March 2012 - 09:04 PM.

[cradley-heathen]

i totally agree with the concept of not going for a 1380 straight away to prolong the life of teh block with future rebuilds, but as stated i have bought the pistons now, so they are a definate.

as i stated earlier, it is a daily driver, but i dont cover a huge distance to get to work, i am willing to compromise a little on the idle to get something like the result i want, but obviousy i dont want it to be horrid to drive when not on full song.

as for emmisions, its a 74 so im really not worried about them as its not tested for an mot.

i am quite interested by a 286 cam, and not using my roller rockers, do you guys have an opinion on this? i am concerned it may be too lumpy at idle, and i will have to ring its neck to get the peak power. i would like to keep peak revs to 6500rpm really.

[ACDodd]

If a daily driver a 286 while a very good cam, is too much cam for a long lived engine in my experience. I would consider somthing like my own ACD - RS or the ACD - RS+, Newman Ph2 or Ph3, Kent 266 or 276.

http://www.mlmotorsp...id=86&Itemid=30

If you want more upto date info, pm me you email and I'll send you a mail shot.

AC

[cradley-heathen]

isnt a 266 quite a long way towards the tame end of the scale? my dad has one in his 998!

[cradley-heathen]

sounds like its a 276 then!

[ACDodd]

Tamer = more mileage before rebuilds. That is the bottom line.

AC

[racingbob]

i take it you are balancing the engine

i would go for the 276

even my mg metro cam is awsome and its like a 266

great for fast daily and still be good for track day

try and keep those revs under 6000 if you want your engine to last

[colinu]

As Jordie said... the Morspeed PH3 is pretty good in a 1380cc. I know 'because I bought that engine/car from him. Unfortunately the crank thrusts went on that engine which meant a full rebuild. Was a pain trying to get a PH3 so I opted for an AC Dodds ACD-RS+ instead... engine now rebuilt just waiting to drop it in the Mini (after I attend to some major body rot).

[jamiestevenbell]

i have a 286 atm and its in my 1293 engine and to be honest i think its a great cam gives the lumpy sound at idle and i dont find it bad in traffic at all, plus it goes well too i would go for a 286 personally maybe even with the high lift rockers but i am abit of a speed freak lol

[jaydee]

Sorry but i dont get you 'tame end' evaluation.
Camshaft evaluation is made by timing, duration and lift, compared to your engine capabilities (compression ratio, crank and stroke, valve size)
And you didnt state the most important thing, the cylinder head spec (valve size, porting, chamber volume ) which dictate the volumetric efficency for your engine.

TO fit a 286 because just people says it cool then you have 9,5 CR and you engine will be as powerfull as a lawnmowner.

As a baseline, with a 1380 not revving above 6.5k rpm I'd expect you might want a torquey engine.
In kent range that means 246, 256 and 266.
Dont bother with the 276 or the 286 in your case.

[Tahiti Joe]

Wasnt the latest range of Kent cams, the 'MD' ones, designed too be used with 1.5 Rockers? Surely then the 286, or any of them for that matter, will run better when used with them? Or am i missing something?