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| Joined: | 03-14-2005 |
| Location: | Atlanta, Georgia USA |
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Now back to the Tim/Judson/Greg 104/107 debate and what I mean by 'hot ticket':
Tim, we really need to get your three engines on the dyno. Perhaps then we'll figure out why you have great luck with the Spec9 Dellortos and my engines prefer Spec10?
The data I've collected suggests there is little benefit to a 104/104 combo when compared to the 104/107 combo.
Garry Kemp’s Creation (Erik Harkes Engine)
Cams: 268^ .425” lift Intake (modified 104)
252^ .378” lift Exhaust (stock 107)
210hp@6250rpm
175ft.lbs@5000rpm
LotusBits.com Creation
Head ported from stock 126cfm to 170cfm
Cams: 272^ .410” lift Intake (stock 104)
272^ .410” lift Exhaust (stock 104)
218hp@7246rpm
171ft.lbs@6232rpm
“Yellow Dog”
Richard Reyman’s 2.2Litre creation
Custom Cams
240hp@7000rpm
185ft.lbs@5500rpm
(If someone could post "Yellow Dog's" cam stats, or any other dyno results, that would be a huge help to us all).
We can be sure there are SIGNIFICANT differences between the 3 different dynos that tested these engines. I'll assume they are all good to within ~5%. If so, they all produce about the same amount of power, only at different rev points.
What I see is pretty simple: Replacing a 107 Ex cam with a 104 cam only shifts Torque and HP up the rev range by ~1000rpm. There are no appreciable gains.
While data doesn't lie, we really don't have enough of it to make a definitive conclusion. One of these days we're going to do a 'dyno-days' so we can document all of these combinations instead of arguing about it....
Last edited on 04-27-2006 01:10 am by Judson Manning