Yea!

I'm wondering though if at 10.5 mil carb bore, it might not help to fuel inject the sucker. Maybe the carb/engine doesn't need it but it might just increase power slightly. All stock "pumped" engines I'm aware of seem to have increased power spec. For example the RF-P vs the RF. No question the YS's breathe on their 11 mils and fuel metering.

OPS, former company of Mr. G. Picco, used to provide Perry backplate pumps for their engines. Now, they were often sold in conjunction with Perry carbs which we don't want but perhaps a regular separate oscillating Perry pump with backplate pressure feed would improve the 7D as well. I'm not sure how the 7D would cope with pumped fuel - Will? Unfortunately it would require tapping the backplate and if you're not happy with the results, getting a spare plate might be pretty hard. Of course, the tap could be just closed off but still.

20% nitro and drop the oil content to 13-15%. Watch the compression though as it could pre-ignite. You may need head shims.

Although I hate to admit it (Picco rocks!), you could likely also increase the speed with a Jett BSE FIRE 90L.

Here's an account:

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[TD="colspan: 2"]Our engines speak for themselves.... and Jett pilots have a lot of good things to say too!
See the Jett Hall of Fame for great application examples
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[TD="width: 300"]"This is a photo of my Jett FIRE 90L with a 15 cc MACS quiet pipe. The Jett machined test stand is bolted to a pre-fab bookshelf which is in turn bolted to a shop stand. Both were purchased from Home Depot. The shop stand cost about 30 bucks.
The 90L turns an APC 11X7 at 16,200 on Sig Champion 15%. This is significantly better than your advertised numbers for the larger 95L.[/TD]
[TD="width: 300"]On the day I checked the 11X7 I was able to turn an APC 10X10 at 16,000 using the same fuel. On a previous test session a few weeks ago I got 16,300 with the 10X10.

For anyone interested in duplicating the setup the total length from the back of the exhaust spacer to the tip of the pipe is 23 inches. This seems to be optimum as I got no more gain from another 3/8" cut which I put back in.

The engine starts, runs, and throttles perfectly with the most instantaneous response I have ever seen in a glow engine. Overall another fantastic Jett engine!"

Gene Greatti[/TD]
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he's just tipping the 3 bhp threshhold on the 10x10 with 3.09 [email protected]. 'nough said.

David