13 replies to this topic

[danrock101]

After going through my old miniworld mags and comparing the results in the RR days to my spec, I'm starting to get worried that my engine isn't going to produce what I'm hoping it will produce, I know it's not all about power and it's about how it drives etc and tourqe but the more power and tourqe it has the faster it goes generally) lol

so here's the spec
1430cc (Stroked, wedged, drilled etc crank, omega 11cc 73.5mm pistons, cooper s rods)
MED 'V' wedge rally head, 36/31mm vavles, was told by MED it will be good for 125bhp
kent 296 cam scatter profile, + 1.5.1 rockers
belt drive kit
stage 2 LCB, RC40 side exit
weber 45 on a good manifold (not got this yet)
staight cut drops, X-pin diff
megajolt
ultalight flywheel + backplate, orange diaphram, rally plate.

I'm hoping for over 100 at the wheels, surely I'm not being optimistic, the exhaust MIGHT restrict it possbly but that's only temp. I can't think of much more I can do to make it more powerfull apart from maybe improve on the head slightly to squeze about 5-10bhp out of it without loosing tourqe
What do you think, I don't want to be disapointed.

Edited by danrock101, 12 October 2010 - 10:16 AM.

[Racer_Pete]

I think 95-100 at the wheels is about right, why are you only using a 286? You could easily get away with a 300degree cam on a 1430cc, how much dose the Mini weigh? What C/R are you planning to run it with?

[danrock101]

Well I wanted more low down tourqe but still contemplating going with a 296 or a 649+ but I've already got 2, 286s but not too late to get another cam, the CR should be 11.1, I belive the chambers are 23cc but not got a burette yet, not sure on the weight of my mini, it's got a fibreglass front+bonnnet, will be trying to lighten it once the engine is fitted, will aim for around 600kg. If I got 95 ATW I'd be more than happy so that's good to know that I'm not just dreaming
now I think about it, I might have to go for a 296 SP

Edited by danrock101, 11 October 2010 - 09:25 PM.

[danrock101]

Ok edited post as I'm definatly getting a 296 scatter

[wzd345]

I have run a couple engines of this capacity to approx your spec.

First one had MED road/comp head, 1.5 rr and 286 cam with new 45dcoe on Maniflow, similar transmission, got 120 bhp and transmission losses were 21bhp.

Second one had MED race head with 1.5rr, 310 cam, same carb, inlet and Quaife dogbox with lsd, produced 135bhp, transmission losses were 21bhp.

Both ticked over perfectly, without fluffing, at 900rpm

Transmission loss is highly dependant upon how well the box is built - range 18/30 bhp. Inlet should be as long as possible, minimum 5ins, 7 is better.

Big bore will help with tractability and will pull well from low down with progressive boot.

Success and longevity depends on how well its put together.

Use a big K&N filter and enjoy.

After going through my old miniworld mags and comparing the results in the RR days to my spec, I'm starting to get worried that my engine isn't going to produce what I'm hoping it will produce, I know it's not all about power and it's about how it drives etc and tourqe but the more power and tourqe it has the faster it goes generally) lol

so here's the spec
1430cc (Stroked, wedged, drilled etc crank, omega 11cc 73.5mm pistons, cooper s rods)
MED 'V' wedge rally head, 36/31mm vavles, was told by MED it will be good for 125bhp
kent 296 cam scatter profile, + 1.5.1 rockers
belt drive kit
stage 2 LCB, RC40 side exit
weber 45 on a good manifold (not got this yet)
staight cut drops, X-pin diff
megajolt
ultalight flywheel + backplate, orange diaphram, rally plate.

I'm hoping for over 100 at the wheels, surely I'm not being optimistic, the exhaust MIGHT restrict it possbly but that's only temp. I can't think of much more I can do to make it more powerfull apart from maybe improve on the head slightly to squeze about 5-10bhp out of it without loosing tourqe
What do you think, I don't want to be disapointed.

Edited by wzd345, 12 October 2010 - 11:10 AM.

[minicb]

are you using the car on the road?? if so I would not use a 296 scatter cam as it is a race cam, you wont have much drivability below 3000 and it’ll run horribly lol

If its power you want and you’re not bothered how the engine runs them by all means go for a 296 cam

Edited by minicb, 12 October 2010 - 12:21 PM.

[the.stroker]

I agree with matt , i have a 296 scatter on my 1380 , ask him how rough it was on the drive to malvern on sunday , unless you give it full beans everywhere its not happy

[danrock101]

err the car will be my daily driver... hmm, I can put up with it being lumpy but I have been looking at the powerband and the 286 seems to be better as I don't fancy reving my engine as high as the powerband goes, should rev past 7.5k with the 286 but I'll probably set the rev limiter to 7.5, am I right in thinking the 286 is 2k-7.5k and the 296 is 3.25k to 8k? lol I'm in a right pickle, I kinda like the idea of a lumpy idle, it sounds so cool, but I want it to pick up quick, the only way I'll truely know what cam would be best for the way I drive is when it's too late haha

[the.stroker]

Mate,really if its your daily drive i would strongly urge you not to get a scatter cam , mine is only used at weekends for fun , and even that was getting frustrating ,all going well until you get stuck behind a " sunday special " , then pretty much un-driveable again.
Your choice at the end of the day mate

[blacktulip]

im going for 127bhp @flywheel

[danrock101]

im going for 127bhp @flywheel

*shivers* that'd do me

ok I've already bidded on a 296 but will probably fit the 286 and see how it goes, if the 286 is enough which it probably would be for my head, I'll save the 296 for if I try and get more out of it, the plan is for this engine to do about a year of daily driving untill I can afford to get a 998 daily driver.

[wzd345]

If this car is going to be your daily driver, I urge you to look lower on the choice of cam profile. However, you have already set the stage with your choice of head and carb. Also, please consider how the emissions will read at MOT test time with the cam you pick. Dont just buy a wide duration cam because you like the sound of a lumpy idle. Set you ideas on the upper limit of the rev range a bit lower. Even if it can rev to 7.5k, should you be doing it all the time?

Have you asked the insurers about this engine and its effect on your premium?

Good luck and enjoy.

err the car will be my daily driver... hmm, I can put up with it being lumpy but I have been looking at the powerband and the 286 seems to be better as I don't fancy reving my engine as high as the powerband goes, should rev past 7.5k with the 286 but I'll probably set the rev limiter to 7.5, am I right in thinking the 286 is 2k-7.5k and the 296 is 3.25k to 8k? lol I'm in a right pickle, I kinda like the idea of a lumpy idle, it sounds so cool, but I want it to pick up quick, the only way I'll truely know what cam would be best for the way I drive is when it's too late haha

[danrock101]

thanks, MOT shouldn't be a problem I've got 8 months MOT or so left anyway, insurance is going to be barsteward! I've got 1 years no claims now, it's my main worry, think it will be about 150 a month, but that's not much more than most of my m8s in there sxi corsas and 2L ford focus etc all same age as me

[danrock101]

OK 296 scatter ordered as I now have another mini to use as the daily.