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1. horsepower (score: 1): Author: Ralph Steinberg <ralph@cloverleaf-auto.com>; Date: Mon, 13 Nov 2000 06:45:37 -0500; does anyone have a rough formula for estimating at the wheel horsepower when you know the flywheel horsepower? Ralph; /html/vintage-race/2000-11/msg00127.html (7,122 bytes)
2. Re: horsepower (score: 1): Author: Brian Evans <brian@uunet.ca>; Date: Mon, 13 Nov 2000 09:13:39 -0500; How about 15% loss for a Hewland( rear wheel drive, all straight cut gears), up to 20% loss for typical rear wheel drive helical trans, and up to 25% for front wheel drive (Mini) if it uses all those; /html/vintage-race/2000-11/msg00129.html (7,686 bytes)
3. Re: horsepower (score: 1): Author: S800Racer@aol.com; Date: Mon, 13 Nov 2000 12:43:16 EST; << How about 15% loss for a Hewland( rear wheel drive, all straight cut gears), up to 20% loss for typical rear wheel drive helical trans, >> I've often heard the 15 - 20 % "rule of thumb". Is this t; /html/vintage-race/2000-11/msg00130.html (7,584 bytes)
4. Re: horsepower (score: 1): Author: Phil Babcock <PHILLIPBABCOCK@worldnet.att.net>; Date: Mon, 13 Nov 2000 13:21:37 -0500; The figure used by most Chassis Dyno Shops is that with a streight shift, that the loss is 15% at the rear wheels. On an Auto it is 20%. Phil -- Phil Babcock The Dyno Shop, Inc. Air Fuel Ratio Meter; /html/vintage-race/2000-11/msg00131.html (7,611 bytes)
5. Re: horsepower (score: 1): Author: Derek Harling <derek.lola@home.com>; Date: Mon, 13 Nov 2000 14:09:39 -0500; I would suspect that the truth is somewhere between your respective answers - in other words the total loss is partially depended on hp/torque transmitted and partially independent. No doubt it is al; /html/vintage-race/2000-11/msg00132.html (8,233 bytes)
6. Re: horsepower (score: 1): Author: "Mark Palmer" <mgvrmark@hotmail.com>; Date: Mon, 13 Nov 2000 20:58:14 GMT; Not a simple thing. Some losses tend to be directly proportional to transmitted power -- like gear mesh losses, bearing losses. Other losses are proportional to speed -- like oil windage. Some losse; /html/vintage-race/2000-11/msg00133.html (8,761 bytes)
7. Re: horsepower (score: 1): Author: "Mark Palmer" <mgvrmark@hotmail.com>; Date: Mon, 13 Nov 2000 21:12:08 GMT; Just sent another reply, but wanted to comment on one or two things here. Loss in gear mesh is due to friction, not "metal bending". Let's hope the teeth aren't bending much or we're in real trouble; /html/vintage-race/2000-11/msg00134.html (10,617 bytes)
8. Re: horsepower (score: 1): Author: Craig Wright <craig@productdesigngroup.com>; Date: Mon, 13 Nov 2000 15:59:22 -0800; I had my street 427 tested and broken in on an engine dyno. It put out 420 hp. Two months later I measured 310 hp at the rear wheels, a 26% change. I did gain 10 hp back by jetting the carb for the i; /html/vintage-race/2000-11/msg00135.html (9,771 bytes)
9. Re: horsepower (score: 1): Author: Craig Wright <craig@productdesigngroup.com>; Date: Mon, 13 Nov 2000 20:09:41 -0800; The engine and chassis dyno hp and torque peaked within 100 rpm. If my headers were bad or the mufflers restrictive I would expect the tailspin. But, the headers are the best that can fit into a Cob; /html/vintage-race/2000-11/msg00137.html (11,975 bytes)
10. Re: horsepower (score: 1): Author: Derek Harling <derek.lola@home.com>; Date: Mon, 13 Nov 2000 23:47:20 -0500; Mark - thx - agreed - almost! Energy is absorbed when you bend (or deflect) the gear metal but only some of it is available to be returned to the system (the rest becoming heat) BUT, unless gears hav; /html/vintage-race/2000-11/msg00139.html (12,154 bytes)

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