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Reply to "VS 1915cc improvement options? Chassis Dyno info"

@GomerP posted:

hi everyone, its been a few months since last post but i do spend some time each day reading up on what going on in the group.

I had the opportunity to get my speedster on a chassis dyno a couple of weeks back. And wanted to get some feedback on the data.  Car runs very well but i am curious if what steps you might recommend to get a bit more Torque out of the existing engine.

Engine specs as i know them....

1915cc as supplied from VS back in 2010.

94 mm X 69

1.11 Rockers

I do not know what cam is installed.

Tri mill Hot Dog exhaust (with heater boxes)

New Weber IDF 40s (jetted using a wideband and a lot of road time.) Replaced the Empi  34s. that came on the car. by the way this had a significant improvement above 4k. rpm

Stock heads  no porting.

Results were about what i expected.

Max power = 67whp @ 3980 rpm Average power = 58whp. Based on typical  calculations this would be about 85-90bhp (at the crank).

Max Torque = 97.5 @ 3360 rpm Average Torque = 70

AF Ratio is pretty flat at 12-12.2 up to about 4800 then drops to around 11.

sorry for the crappy screen shot.

Dyno

@GomerP posted:

Oh Al.. now you got me second guessing.
what you noted is kinda what I was initially thinking I would get in the way of feedback.
so the thought process is start with rockers & port work. See if I am satisfied (hahahahah I am never satisfied that’s the point of this hobby) 110 Bhp is kinda what I have in mind for now. And of course I’d kinda like to push this engine a bit even if I do build another monster.  I do not know any good shops that I would trust to do port work on my existing heads. If anyone has a recommendation I am all 👂s.
question on rockers. If I am not changing the crank do I need new pushrods. I see a lot of conflicting info on the great inter web... if I go from say the 1.1 to 1.2+  
As for the heater boxes unfortunately they must stay if I want SO acceptance/ buy in. She asked asked a lot fewer questions about what I spend when she gets to enjoy the ride.  

exhaust is another question, I read that the tri mill hot dog I Have starts to be an issue anything north of 90bhp.

recommendations on merged header are welcome.  

oh this is going to be fun.. now I want to hop up the 1915 and start a fresh build.  Yes y’all are great at spending my $$$$

@Pat Downs Any advice you could offer this gentlemen regarding his desire for more power out of his anemic 1915cc?

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