dyno numbers for CIS B-motors (na)

[theoneGroo]

i put my orange rally car on the dyno before taking it apart.. 110 hp and 114 ft/lbs torque at the front wheels.. umm wow

oh and the car weighed in at 2875 lbs... dont forget to add in nearly 450 lbs of driver co-driver and you have a recipe for awesome acceleration everywhere!

its an H engine and that engine had some mss flat top pistons, mss cam (which one?), dual valve springs, aluminum flywheel, msd 6-al ignition box, rally gearbox, 4-2-1 mss header, 2.5" exhaust and dented to hell glass pack... it peaked at 6800 and fell like a safe from a tall building right after that... that was with a no lamda fuel distributor with the bigger air inlet, and a k&n filter.. the ports were matched but not polished... the cam was supposed to be good for over 8000 rpm but i broke too many lifter buckets with the limiter set at 8200, no problems at 7800... the stock 5 speed box needed the extra revs because the gearing wasn't so good, the rally box never really saw much over 7000 as the gearing was so much closer...

i never really played with the cis so have no idea what it could have done with decent fuel management...

oh and the engine is sitting on a pallet under a tarp, anyone want it?

[fiasco]

oh and the engine is sitting on a pallet under a tarp, anyone want it?[/quote]

That's rallyho bait, isn't it?

[Luke]

oh and the car weighed in at 2875 lbs... dont forget to add in nearly 450 lbs of driver co-driver and you have a recipe for awesome acceleration everywhere!

Hey but it did the job for you! What 7th overall at CT or something?

[99sven]

Put out 115 at the wheels about five years ago. I was standing next to it and it was loud!!! He drove it to the dyno from home and you could hear him coming from a half mile away.

[GRMPer]

Improved Touring B VW guys are putting out 120+ at the wheels from 1.8 liters with stock cams and stock heads. They port match, have good valve jobs, balance everything and make sure the mixture/timing are spot on. I would think the 2.0 Saab could get close to that with decent tuning

Of course, slapping a turbo on it is probably cheaper in the short run.

[theoneGroo]

thanks luke for that... the car was the loudest at the dyno shop they ever had, and they laughed at me when i signed the waiver and told them i hoped to break 100 hp at the wheels... oh and those stock wheels are so soft... i'd bend everyone of them i brought to a rally (usually 12-14) i wouldn't recommend using them, haha

[Rallyho]

100hp sounds right. my mildly build b-motah and my groo built H-mill had similar specs to this.

However, I would think that a 2.3 head, ITB, 16v with all the trimmings would have to pump out another 50hp to the wheels.

[sonett]

A 20% loss seems to be a pretty good assumption. I think Jack claims a certain percentage gain for each one of his components. I know that the headers and MSS system alone made a perceptible improvement in the but dyno. Ad in the 3800 -7800 cam and things get even better. The next step would be a Djet manifold sporting a megasquirt fuel injection system

This 20% loss you mention, do mean 20% transmission loss?

[Jordan]

I'd assume he means all parasitic losses from when the torque leaves the crank, most of which is drivetrain. I'd hope for about 125whp with the twin webbas , cam,header , exhaust and increase in static compression. Would those h-motor pistons work in a b-motor? I think so?

[Crazyswede]

A 20% loss seems to be a pretty good assumption. I think Jack claims a certain percentage gain for each one of his components. I know that the headers and MSS system alone made a perceptible improvement in the but dyno. Ad in the 3800 -7800 cam and things get even better. The next step would be a Djet manifold sporting a megasquirt fuel injection system

This 20% loss you mention, do mean 20% transmission loss?

yes I mean all the power loss from everything and anything beyond the crank. 20% may even be on the low side as the saab transmission design and engine layout is not the most ideal for power transmission.

[sonett]

I think you may find you are going the wrong way, try 15% or to be even more accurate try, wheel figure plus 10,divide by 0.9. This should get you a ball park figure, assuming of course the dyno is reasonably accurate.

[Crazyswede]

%20 actualy came from years and years of off the top of my head guessing

[Luke]

no you are wrong it is 19.4356 %

Edit:
of course that is at sea level, 72 degree fahrenheit and 58% relative humidity.

[TRAILINGTHROTTLE]

so drivetrain loss is a constant???

[Luke]

I dunno who cares about numbers really. When people ask me how much power my car makes I prefer to quote the numbers in BFP.. (butterfly power) It sounds much more impressive that way.

Person: How much power does that make:
Me: 9048 BFP
Person: Dayum!