tuned 1098 sluggish

Post by **Kevin** » Thu Apr 15, 2004 12:42 pm

If its not too painfull a question how much did the rolling road cost, do they charge by the hour or what ?

Post by **racer** » Thu Apr 15, 2004 1:23 pm

Hi The pain is gradually ebbing away as the smile on my face increases when I drive it !!! The guy spent 2 1/2 hrs on it (a long time,according to him) It cost £150 plus vat . There are things you can find that you could never do by testing all day long. To see (and feel ) your vehicle at full chat ,anchored to the floor is something else !!!!! My speedo isnt accurate so you use the dials on the machinery . At 75/80mph he released the bias on the rollers to let it run free ,I saw about 87mph! At one point ,I thought this can't go on for much longer ,but he just held it there ,fiddling with the carb etc to get max potential!!!! The hairs on my neck stand on end thinking about that day!!! Oh well I'm off to pull my engine to change the oil pump.

Post by **Robins** » Thu Apr 15, 2004 7:06 pm

[/quote]the lumenition actually expired whilst on the r/road!!![quote]

So these Lumenition things are rubbish then?! I had thought this since my first one blew up 2 years ago but everyone said they were fine so I got another, oh well thats another gadget that will take up shelf space in my shed.

I was going to suggest rotor arm aswell as mine gave out completely at the weekend, total short to earth, but haven't had chance to test with a new one since getting towed back in.

Thanks for letting us know your results mate, been a great help.

cheers, Daniel

Post by **racer** » Thu Apr 15, 2004 11:07 pm

Apparently the magnatronic lumenition is crap . They either go for 3 weeks or 3 years,so I've heard When it was on my car it was ok ,but their tech dept couldnt pinpoint the prob of misfire . The best one for road use is the optronic with seperate external module (about £150)They are going to replace myone foc,but I'm gonna sell it and buy another better one .(magnatronic is good for about 6000rpm ,so ok for general use )IF it keeps going . As soon as he heard the first run on the rollers ,the guy said ignition -not another lumenition by any chance ?!

Post by **mowoggy** » Fri Apr 16, 2004 6:15 am

Hi

The 12G295 head is the same depth as the rest of the A Series I've seen (2.75"). If yours is 2.625 it's had 125 thou skimmed off it which would take the combustion volume down to around the same as the 950's (23cc) What sort of cranking pressure does it give ?

I took 60 thou off a 295 head on a 1098 bored out to 40 thou, it runs well on 91 octane gas and has plenty of torque - sweetly pulls up hills in top that I used to change into 3rd (with a dab into 2nd) to tackle.

Cheers

Post by **Cam** » Fri Apr 16, 2004 8:58 am

The best one for road use is the optronic with seperate external module (about £150)They are going to replace myone foc,but I'm gonna sell it and buy another better one

Get an Aldon Ignitor. VERY good, no external modules (all inside the dizzy) static timing no problem. I have had mine for about 10 years now and I think I paid about £70 for it from Aldon Automotive.

Post by **rupert** » Fri Apr 16, 2004 8:09 pm

wow this is all good stuff as I'm planning exatly the same spec (when I finally get my car back on the road) I was running a HS4 and was planning on ditching it in favor of a HIF. Where's the yellow pages - I'm going to book a rolling road session! - hang on - I'd better put the engine back in first ...

Rupert

Post by **racer** » Fri Apr 16, 2004 8:21 pm

Been doing a bit of road testing today -showing off really -with my new found oil pressure ! It pulls from 25mph in top ,and easily now keeps up with traffic on slight inclines ,whereas b4 I had to keep changing down to 3rd/2nd . To be honest,if you havent got any major "cant suss it out "type faults ,you would prob. get more or less the same result from a GOOD Krypton tune .Owning the machine is one thing -being able to use it is another !

Post by **Cam** » Fri Apr 16, 2004 9:20 pm

you would prob. get more or less the same result from a GOOD Krypton tune .Owning the machine is one thing -being able to use it is another !

Yes, the operator is more important than the machine. I had my MGB krypton tuned about 6 years or so ago and it ran awful afterwards, so I booked it in to a back street garage for a 'tune-up' with an old guy and a screwdriver! It cost virtually nothing and it ran beautifully afterwards! No technology, just experience!

Post by **racer** » Fri Apr 16, 2004 10:30 pm

When I ran a mid mounted rover in my toyota van ,I had hometune to look at it ,when i pulled the engine lid ,the guy was speechless! He hadnt got a clue how to tune something out of the ordinary ,and made an excuse about not getting a good co reading because of the twin pipe system.!!!

Post by **Peetee** » Sat Apr 17, 2004 8:40 pm

If you still have this missfire problem it may be worth changing the spark plugs for a set of cooler ones.

Post by **racer** » Sat Apr 17, 2004 8:59 pm

I asked the r/r guy about that ,he reckoned my plugs were fine (standard for 1098,cant remember number)My slight missfire is down to the carb choke spindle worn . When I ran it @2000rpm on r/r he was able to stop and start the missfire by moving the cam on the end of the spindle -try finding that by trial and error !!! Thanx for your idea though! ROD

Post by **IslipMinor** » Mon May 10, 2004 9:53 pm

I would look at the compression ratio. The 12G295 head ran on the 998 Cooper with a raised 'D' section on the pistons. The standard 1098 pistons are dished, so it is likely that you have quite a low CR, when want you want is at least 9.0:1 for any sort of performance.

What cranking pressure do you get, and how even is it across the 4 cylinders?

Post by **racer** » Tue May 11, 2004 7:23 am

I understand your comments,but as I posted previously , I't was thought that the head had already been skimmed . I'ts fine now ,BUT ,AS AN UPDATE .....It is feeling a bit lumpy on tickover,after a couple of long runs and sprints down the motorway (legal limit of course!). I reckon its the points closing upetc -have got my replacement lumenition module,so may give that a go again .