Search found 274 matches
- March 24th, 2011, 12:11 pm
- Forum: Novice Area
- Topic: oil filler oil leak
- Replies: 20
- Views: 10815
Re: oil filler oil leak
As a quick fix, you might try "shimming" the inside pipe wrench with some aluminum sheet metal. I'm pretty sure I've done this in the past with a smaller wrench and it worked OK. You can mock it up with the nut on the bench and get the aluminum to conform and reduce the effective ID of the...
- January 26th, 2011, 6:33 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Front axle preparation
- Replies: 72
- Views: 40687
Re: Front axle preparation
One thing that helps a lot is to adjust the brakes up hard *before* you bleed them. This minimizes the fluid volume in the wheel cylinder by pushing the pistons in as far as they will go. Because it pushes the top piston down (in the 3- 9 o'clock locations), it also reduces the height difference bet...
- December 27th, 2010, 7:48 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: rear droop/camber set up
- Replies: 77
- Views: 39835
Re: rear droop/camber set up
John,
Try changing your limiter spring rate to a constant 50 or 100 lb/in and see what it looks like.
Try changing your limiter spring rate to a constant 50 or 100 lb/in and see what it looks like.
- December 27th, 2010, 7:33 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: After Market Spindles
- Replies: 23
- Views: 15953
Re: After Market Spindles
In my opinion the way to essentially guarantee that neither the aftermarket nor the original spindles will fail due to fatigue is to use the spacer kits now available from FV suppliers like Mike Palermo (contact info above). When installed properly these spacers increase the strength and stiffness o...
- December 26th, 2010, 9:54 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: rear droop/camber set up
- Replies: 77
- Views: 39835
Re: rear droop/camber set up
But doesn't "spring rate" have a sign? Remember, the droop limiter will be working in *opposition* to the spring. So does the total spring rate (spring + limiter cushion) go up or down when the cushion is engaged? That's why I'm confused as to what the spring rate is with a compliant droop...
- December 26th, 2010, 1:59 am
- Forum: Tech Tips, Rules, and Safety
- Topic: rear droop/camber set up
- Replies: 77
- Views: 39835
Re: rear droop/camber set up
Nobody should worry about their engineering abilities. Raise questions when something does not make sense. There is probably another way of making the point. " Assuming this 600 lb. mass, or weight, is rolling down the track I would think that a bump that causes a 100 lb. vertical load, which ...
- December 23rd, 2010, 2:05 am
- Forum: Tech Tips, Rules, and Safety
- Topic: rear droop/camber set up
- Replies: 77
- Views: 39835
Re: rear droop/camber set up
Not to pick nits (too much), but a "600lb spring" is actually a 600 lb *per inch* spring so with a 600 pound load applied it will compress 1 inch. As far as "preload", I can see how the rear of an FV could get confusing. If you are talking about the spring preload, it could be ei...
- December 14th, 2010, 2:18 pm
- Forum: Novice Area
- Topic: Alignment tips..
- Replies: 13
- Views: 5843
Re: Alignment tips..
I know some people do, but I've never tried to "adjust" front camber with the link pin shims (those are the link pins -> horizontal, 2 per side vs king pins -> vertical, 1 per side). My preference has always been to have everything as tight as possible with no binding. I would argue that a...
- November 15th, 2010, 1:09 am
- Forum: Novice Area
- Topic: Where to start?
- Replies: 24
- Views: 19953
Re: Where to start?
Jeff, I think I've needed my Aim beacon about twice in 5 years. Usually there are a bunch of them near SF. You might need one at some point, especially if the races you will go to are lightly attended. This might be more likely at regionals but still, I think I'd save my money for now. Lacking a bea...
- November 7th, 2010, 3:08 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Static Rear Camber Setting
- Replies: 39
- Views: 25848
Re: Static Rear Camber Setting
Chris, What we are considering is the change in the lifting force provided by the spring as the car is jacked due to the jacking forces (total rear camber going from negative towards positive = spring getting longer). For any given rear suspension spring/rocker/pushrod geometry on the same car, any ...
- November 5th, 2010, 5:36 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Static Rear Camber Setting
- Replies: 39
- Views: 25848
Re: Static Rear Camber Setting
From your weight transfer spreadsheet, the total weight transfer number for a 1" CG change is about 12 lb. I assume that includes the change in the roll center. If so, I estimate about 3-4 lb of weight transfer change per degree of rear camber. I don't think that's correct. One of the assumpti...
- November 5th, 2010, 4:33 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Static Rear Camber Setting
- Replies: 39
- Views: 25848
Re: Static Rear Camber Setting
Brain H. I made a CAD "stick" model of the rear swing axles of a Vee. Chassis roll only changes camber about 0.1 degree of camber per degree of roll. As expected, the outside goes more negative and the inside more positive (supporting Chris's assumption). However, the change is probably sm...
- October 27th, 2010, 4:41 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Rear Roll Resistance Never Needed
- Replies: 114
- Views: 554362
Re: Rear Roll Resistance Never Needed
I'll try to get to my spreadsheet tonight. It's been a while. I can't remember whether the roll center is fixed or changing automatically. same for the CG height (which was just a swag). But don't forget that both the CG AND the rear roll center are rising as the car jacks. Both of these are increas...
- October 27th, 2010, 12:17 am
- Forum: Tech Tips, Rules, and Safety
- Topic: Rear Roll Resistance Never Needed
- Replies: 114
- Views: 554362
Re: Rear Roll Resistance Never Needed
Brian, What I was trying to get at is the unstable nature of a swing axle suspension without a droop limiter. The jacking can go "over center" because there is a source of positive feedback in the jacking forces. As the car jacks, the roll center is moving: UP. This is causing MORE weight ...
- October 25th, 2010, 12:41 am
- Forum: Tech Tips, Rules, and Safety
- Topic: Rear Roll Resistance Never Needed
- Replies: 114
- Views: 554362
Re: Rear Roll Resistance Never Needed
Having run a potentiometer on my rear shock for the last few years, I can state with some confidence that MY car corners ON the droop limiter in every corner at RA except turn 5. In every other corner, the shock (my droop limiter) is at full extension by about mid-corner in all other corners. I happ...
- October 12th, 2010, 10:48 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: A Mono Shock rotary damper system...
- Replies: 66
- Views: 107966
Re: A Mono Shock rotary damper system...
The above link worked for me earlier but won't now.
Try this:
https://sites.google.com/a/slu.edu/me_s ... ing/design
Try this:
https://sites.google.com/a/slu.edu/me_s ... ing/design
- October 12th, 2010, 12:11 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Brake bias and general brake questions..
- Replies: 18
- Views: 12357
Re: Brake bias and general brake questions..
Having the bias bar "level" or parallel to the bulkhead when the brake pedal is fully depressed probably means having the push rod longer on the front master than the rear when the pedal is "at rest". This is due to the larger wheel cylinders on the front brakes than the rears. B...
- October 7th, 2010, 11:10 am
- Forum: Event News, Info, and Results
- Topic: Official FV Discussion: SCCA Runoffs 2010
- Replies: 95
- Views: 99014
Re: Official FV Discussion: SCCA Runoffs 2010
Mike, if you do get the consolation prize, you'll have to share it with me (Q3).
More of a booby prize for the week for me.
More of a booby prize for the week for me.
- September 17th, 2010, 5:24 pm
- Forum: Event News, Info, and Results
- Topic: Official FV Discussion: SCCA Runoffs 2010
- Replies: 95
- Views: 99014
Re: Official FV Discussion: SCCA Runoffs 2010
Probably about as good as you will get looking ahead:
http://www.weather.com/weather/tenday/USWI0554
For daily detail:
http://www.weather.com/weather/wxdetail ... 4?dayNum=1
Pretty typical for September in Wisconsin.
See many of you there shortly.
http://www.weather.com/weather/tenday/USWI0554
For daily detail:
http://www.weather.com/weather/wxdetail ... 4?dayNum=1
Pretty typical for September in Wisconsin.
See many of you there shortly.
- September 9th, 2010, 12:39 am
- Forum: Tech Tips, Rules, and Safety
- Topic: Proposed Runoffs Qualification Rules For 2011
- Replies: 32
- Views: 22038
Re: Proposed Runoffs Qualification Rules For 2011
Name a racing series that doesn't have to lap other cars? Pro, or otherwise? Nascar? Indy? F1? Heck, ALMS has multiple classes on the track for 24 hours in a row and they make it work. If you have to lap traffic at the Indy 500, or the Daytona 500, or the Monaco GP, then why are we so exclusive tha...
- September 8th, 2010, 2:51 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Proposed Runoffs Qualification Rules For 2011
- Replies: 32
- Views: 22038
Re: Proposed Runoffs Qualification Rules For 2011
Do you guys really want to pay extra to not have back-markers? Brian Not really, but I think I might prefer it to the current situation. As I said earlier, the bigger problem is NOT at the Runoffs, but in normal national races with mixed classes. At the Runoffs if there is a car or two that is way ...
- September 7th, 2010, 12:10 am
- Forum: Tech Tips, Rules, and Safety
- Topic: Proposed Runoffs Qualification Rules For 2011
- Replies: 32
- Views: 22038
Re: Proposed Runoffs Qualification Rules For 2011
Do you realize how much slower 120% is? A rule that might actually have a real effect on who qualified be about 110%, maybe less. At RA a Vee running 120% of the best qualifying time would be at about 3:12 (a slow drivers school time or a mediocre lap in the rain). In a 13 lap race, someone running ...
- August 30th, 2010, 1:06 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Needle Bearing Front Beam Spacers
- Replies: 32
- Views: 19572
Re: Needle Bearing Front Beam Spacers
Bearings are free If bushings and bearings are interchangeable words, then you are correct and I'd agree with your interpretation. However, you will not find "Bearings are free" in the FV rules except for specific applications (e.g. wheel bearings). The catchall wording in C.1: "No c...
- August 30th, 2010, 11:21 am
- Forum: Tech Tips, Rules, and Safety
- Topic: Needle Bearing Front Beam Spacers
- Replies: 32
- Views: 19572
Re: Needle Bearing Front Beam Spacers
Technically, "fasteners" are free not "hardware". Subtle difference I know, but room for doubt as to whether a thrust washer/shim is a fastener. This concept does get stretched a bit sometimes... From the GCR: C.10. Non-Standard Parts The use of the following non standard replace...
- August 26th, 2010, 8:14 pm
- Forum: Tech Tips, Rules, and Safety
- Topic: Link pin shims with angled bushings
- Replies: 56
- Views: 36806
Re: Link pin shims with angled bushings
Steve, I think EVERYTHING is bending! -Jim No truer words were ever spoken both from the theoretical (everything does bend/move some when loaded) to the practical (it all adds up) yielding a huge loss in camber "control". But amazingly is seldom breaks, except for the spindles... And we h...