Help ,optimum Distributor Spec (pug Sport Spec ?)

[Dazza 4]

Help Guy's , is there an optimum specification for the Distributor origionally from my 1.9 SBC 8V engine that i intend using to run my 1.9 MI 16V Engine , i dont want to go the ECU route just yet .

The dizzy's boxed up ready to go to away for a rebuild.

 

The 205 is a trackcar and only gets used on the road for light tests and commute to the circuits.

 

Relavant Spec only ,hopefully to assist your thoughts;

 

1905 alloy MI 16.

 

Lightened and balanced bottom end fully rebuilt with all new parts .

Modified chambers to the cylinderhead (P+P) and skimmed to provide 11.1 CR

CAT-CAM 528'S , 8000 rpm limit max , Piper Evo adjustable pully's ( Bright Yellow Cam Cover ,sorry Mattsav ha )

Maniflow exhaust manifold

Jenvey inlet manifold on new weber 45's

I wont be connecting the vac pipe from the diaphram to the inlet manifold as there isnt enough vac pressure to make a difference iam told by my RR centre .Infact the diaphram and adv arm's been completely removed , ie it doesnt exist ..

 

1.9 gti gearbox with MI16 F/D

 

My reason's for staying with the trusty old dizzy are that its easy and untechnical in case of failure on track and i really dont like early baths when enjoying a good old thrash .I am expecting to be using the 4-7500 rpm band mostly ,i dont really see me dropping below this much ,its all about topend pull for me .

Thanks all ,Dazza.

 

ps ,what kind of power should i expect from this engine ?

Edited March 11, 2007 by Dazza

[brianthemagical 1]

i'm guessing it's the advance curve your on about? best way is to get the optimum curve set on a rolling road then sendthe dizzy off to get permenantly set as so.

[James_R 3]

ask someone with that spec on bodies to give you their ignition map, then compramise on low throttle adnavce at lower revs and max advance at high up WOT.

[Martin W 0]

As said above but trial and error is the only way to get the best curve, best on a rolling road. Thats why I went for Omex ignition management. Having driven with both the dizzy adapter and Omex ignition management the omex provides a much smoother power delivery.

 

Also, we found a problem on my brothers Mi + carbs (similar power output to what you are expecting), in that the distributers just did not last for whatever reason, also always replaced with genuine pug items. Since he switched to Omex the power is delivered smoother and its been totally reliable.

 

You may find it hard to find someone who have altered their advance curve because from experience most people just stick with the stock item. Might be worth having a chat to Pete F, he had his 8valve curve altered and might be able to give you some advice on what to settings to choose.

[Dazza 4]

Thanks guy's ,Martin as you'll know iam a great fan of the guy's at DES and do have a certain link to our rallycross champion ,Pauls was one of the engines i did research whilst i was planning my engine spec , Des have had a big hand in the engine to ,there all in favour of me loosing the dizzy and i will later this year for the ecu upgrade or they will never let me live it down !! If my engine reaches the power Pauls does i will be extremely happy ,i will record the evidence on the camera mount i bought from paul .I will PM Pete f to pick his brains a little .

Thanks Martin .

Edited March 12, 2007 by Dazza

[petert 607]

Once a distributor reaches its maximum advance it can only deliver a straight line. Say for example your dizzy reaches maximum advance at 3000. From then on, the timing angle is the same. With a highly tuned Mi16, it's far from a straight line, particularly from 3000-5000, where considerable torque can be found by optimising the advance.

 

The maximum advance for your engine will be approx. 27-28 degrees, a few less than the std. 30 of an 8V. You also need it to idle at approx. 14 degrees, rather than 10 degrees.

[rescue dude 0]

Hi Dazza where are you sending the dizzy to be rebuilt?

 

I can highly recommend the guys at H&H ignition services.

[Dazza 4]

Once a distributor reaches its maximum advance it can only deliver a straight line. Say for example your dizzy reaches maximum advance at 3000. From then on, the timing angle is the same. With a highly tuned Mi16, it's far from a straight line, particularly from 3000-5000, where considerable torque can be found by optimising the advance.

 

The maximum advance for your engine will be approx. 27-28 degrees, a few less than the std. 30 of an 8V. You also need it to idle at approx. 14 degrees, rather than 10 degrees.

 

Thanks Peter ,i will pass on this information .

Dazza.

 

Hi Dazza where are you sending the dizzy to be rebuilt?

 

I can highly recommend the guys at H&H ignition services.

 

Youve got it mate ,H+H are doing it .