Search found 86 matches
- Wed Feb 13, 2013 10:24 am
- Forum: Engine Tech
- Topic: exhaust reversion question
- Replies: 52
- Views: 12793
Re: exhaust reversion question
Here is a picture of the torque-cone inserts: http://images.motorcycle-superstore.com/ProductImages/OG/0000-Kuryakyn-Torque-Cones---.jpg When I got my bike it came with on in the box of spare parts. Never even thought about trying it - I built a pipe to PipeMax specs which has a smaller 1st primary....
- Fri Feb 08, 2013 11:00 am
- Forum: Engine Tech
- Topic: Weber DCOE Tuning Advise
- Replies: 37
- Views: 10859
Re: Weber DCOE Tuning Advise
As for the compression, as of next year (2014), compression is going to be restricted to 15.1 on SIR motors in SCCA racing, but that's another topic. Regardless, let's steer this back to Kyle's issues with mixture. Just thought it was interesting that Mike also said to think of the motor as a runnin...
- Fri Feb 08, 2013 10:31 am
- Forum: Engine Tech
- Topic: Weber DCOE Tuning Advise
- Replies: 37
- Views: 10859
Re: Weber DCOE Tuning Advise
Bill, Here is a Mike Jones (camking) post about an engine restricted via a SIR: With computer controled timing and fuel, you can design the engine to turn much higher then the restriction. You need to go as high as possible on the compression ratio(16+:1, if you can get it). Don't look at it as a re...
- Thu Feb 07, 2013 8:27 am
- Forum: Engine Tech
- Topic: Weber DCOE Tuning Advise
- Replies: 37
- Views: 10859
Re: Weber DCOE Tuning Advise
Madbill, I get your reasoning on "choke point" and the increasing enrichment at successively higher RPMs, with ultimate enrichment when the SIR goes sonic. Since the rules mandate a restriction BEFORE the carburetor bellmouth, would there be any benefit to using a 25mm venturi in the carb...
- Wed Feb 06, 2013 11:06 pm
- Forum: Engine Tech
- Topic: Weber DCOE Tuning Advise
- Replies: 37
- Views: 10859
Re: Weber DCOE Tuning Advise
Perhaps the biggest issue with such a wrong-headed rule would be if the car had to compete against similar vehicles equipped with EFI. Bill, He does and there is no weight penalty or SIR size change for EFI vs carb. t is likely that you would benefit from putting the 25mm restriction between the ca...
- Wed Feb 06, 2013 10:12 pm
- Forum: Engine Tech
- Topic: Weber DCOE Tuning Advise
- Replies: 37
- Views: 10859
Re: Weber DCOE Tuning Advise
Just to be absolutely clear, you have a plenum feeding the carbs and it in turn gets its air through a single 25 mm orifice? I'm not Kyle, but I am friends with him and know the ruleset he has to run under. It is a 25mm SIR that feeds into a sealed plenum. They have to perform a 'stall test' per ru...
- Thu Jan 24, 2013 11:21 am
- Forum: Offtopic Forum
- Topic: I sure miss Big Joe Sherman.....
- Replies: 110
- Views: 19660
Re: I sure miss Big Joe Sherman.....
I remember when this site was dominated by professionals and every thread was a gold mine of information. As time as went on, it's gotten less so- mostly because a lot has already been said, but people are still developing engines so there should be something to be said. Erland, MadBill, BigJoe, Joh...
- Thu Jan 03, 2013 8:12 pm
- Forum: Engine Tech
- Topic: 2.2hp/cube in 1967. Cosworth F1 Engine Specs.
- Replies: 13
- Views: 1778
Re: 2.2hp/cube in 1967. Cosworth F1 Engine Specs.
This was posted on a different forum: http://www.youtube.com/watch?v=xbB1qwhKaaE The pattern making starting around 28 minutes in is really neat. Real craftsmen. With today's methods they could build an equivalent pattern to far closer tolerances in about 10% of the time required by the band-saw an...
- Wed Jan 02, 2013 3:55 pm
- Forum: Engine Tech
- Topic: 2.2hp/cube in 1967. Cosworth F1 Engine Specs.
- Replies: 13
- Views: 1778
Re: 2.2hp/cube in 1967. Cosworth F1 Engine Specs.
This was posted on a different forum: http://www.youtube.com/watch?v=xbB1qwhKaaE The pattern making starting around 28 minutes in is really neat. Real craftsmen. Here is part two of that video. http://www.youtube.com/watch?v=gqfVAGOaGEc I believe these videos were not about Duckworths V8 that I pos...
- Wed Jan 02, 2013 12:06 pm
- Forum: Engine Tech
- Topic: 2.2hp/cube in 1967. Cosworth F1 Engine Specs.
- Replies: 13
- Views: 1778
Re: 2.2hp/cube in 1967. Cosworth F1 Engine Specs.
This was posted on a different forum: http://www.youtube.com/watch?v=xbB1qwhKaaE
The pattern making starting around 28 minutes in is really neat. Real craftsmen.
The pattern making starting around 28 minutes in is really neat. Real craftsmen.
- Sat Dec 22, 2012 9:05 pm
- Forum: Offtopic Forum
- Topic: Road Race
- Replies: 15
- Views: 17590
Re: Road Race
Something to add, There aren't a whole lot in the ways in purses in road racing. There are contingencies, if you're fast (usually a free set of tires). Probably no different than it is in circle track. Politics, like in any series, are strong. SCCA has a reputation for a lot of politics. Being a mem...
- Sat Dec 22, 2012 8:38 pm
- Forum: Engine Tech
- Topic: Pulling crankcase vacuum on single cylinder.
- Replies: 10
- Views: 1701
Re: Pulling crankcase vacuum on single cylinder.
It's possible, even likely, that a check valve leading to atmosphere will create a higher vacuum than would the exhaust. It sounds though that you just want to use the exhaust regardless, in which case have at it. BUT if what you care about is the benefits of crankcase vacuum, a crankcase check val...
- Sat Dec 22, 2012 8:06 pm
- Forum: Engine Tech
- Topic: Pulling crankcase vacuum on single cylinder.
- Replies: 10
- Views: 1701
Re: Pulling crankcase vacuum on single cylinder.
MODNROD, Thanks, those look interesting. The Yamaha SR/XT/TT 500 is a bit of a hybrid dry sump set-up, with the top tube of the frame holding oil. On flattrack 'framers' the oil is held in a tank behind the motor. The valve cover is vented into the top tube of the frame, while the crankcase is vente...
- Fri Dec 21, 2012 9:37 pm
- Forum: Engine Tech
- Topic: Pulling crankcase vacuum on single cylinder.
- Replies: 10
- Views: 1701
Re: Pulling crankcase vacuum on single cylinder.
536cc single running to about 7500rpm with roller bearings on the crank and big end of the connecting rod.BigBro74 wrote:is it a splash oil -like a 5 horse? would wonder about how it might affect this oiliing setup.
Thanks Bill. Just curious is all.
- Fri Dec 21, 2012 8:04 pm
- Forum: Engine Tech
- Topic: Pulling crankcase vacuum on single cylinder.
- Replies: 10
- Views: 1701
Pulling crankcase vacuum on single cylinder.
It's been hashed out on this site on the importance of pulling crankcase vacuum on multiple cylinder engines. If not through vacuum pumps or dry sumps, through exhaust breathers. I think the best method with exhaust system set-ups was to center it in the middle of the collector. So what about single...