4wd Dyno Cell Project - Build Log, Discussion & Pictures. (DYNO IS IN !!)
11-11-2012, 09:14 AM
#122
The second problem is exhaust gas extraction - if that exhaust gas is allowed to stay in the room then it poisons both the humans in there and ruins the engines results as the oxygen is being replaced by exhaust gas. Its also very hot of course, so adds to teh room temps again. Worse still, if its MAPPED in such a scell there is a very very strong chance the engine will grenade itself once it sees fresh air for its inlet and cooler charge temps.
I could go on... the list is endless. Building a good dyno cell is NOT as simple as it first appears.
Last edited by Stu @ M Developments; 11-11-2012 at 09:15 AM.
11-11-2012, 09:21 AM
#123
Thanks guys, it finally feels like it might even work one day. 
Lighting, HD cameras, TV's and Computer systems are next. More cash....
My intended airflow is going to cause plenty of headaches yet though as 900+ room changes per hour is a LOT of air movement... watch this space as its soon time to start working out the differential pressures between the cell and the outdoors but I fear the fans I need arent going to be here before the dyno itself.
Lighting, HD cameras, TV's and Computer systems are next. More cash....
My intended airflow is going to cause plenty of headaches yet though as 900+ room changes per hour is a LOT of air movement... watch this space as its soon time to start working out the differential pressures between the cell and the outdoors but I fear the fans I need arent going to be here before the dyno itself.
11-11-2012, 07:30 PM
#128
11-11-2012, 07:39 PM
#129
Stu, I ran mechanical install on hybrid electric motor brake dyno test cell earlier this year. They didnt require as many air changes as you but they were sizeable! I dont have the info with me tonight but I am in the office in the morning. I know some very competitive suppliers in the Midlands and would say send me the fan details you have been quoted. I would imagine I could sort you a good price. Will PM you my email addy, Chris...
13-11-2012, 04:35 PM
#130
Nothing much to report about the cell progress this week so far, its all painting and decorating, but I have managed to get the dyno cells PC Connectivity finished in a custom faceplate I am pretty proud of.
Wired for total redundancy, so should save any downtime in the future.
Wired for total redundancy, so should save any downtime in the future.
16-11-2012, 08:14 AM
#139
I was going to say, you will have to be careful you don't get a big depression in the cell.
If your exhaust extraction is good, and the cars engine doesn't have any leaks, I think you may be surprised at the amount of airflow actually needed. How are you going to control fan speed? PID with cell temp? Or to hold a certain cell pressure?
If your exhaust extraction is good, and the cars engine doesn't have any leaks, I think you may be surprised at the amount of airflow actually needed. How are you going to control fan speed? PID with cell temp? Or to hold a certain cell pressure?
Actually, we WANT a depression in the cell, otherwise the cell can force deadly fumes into surrounding buildings / offices, but it wants to stay on the atmosphere side of 1/2 water otherwise it will cause no end of problems with mapping as i suspect you are referencing with your comment?
Agreed that with a well sealed engine and transmission we could get away with probably 300 changes per hour, but lets face it, in our industry those cars are few and far between.
(yes, I am pointing at you bastards with open breather pipes..
) But of course one most not forget the extra loading from tyres, retarders, hubs, transmissions and exhausts. On big power cars that is a lot of heat to be transferred to maintain a cell temperature that will mimic road temperature conditions and this is whee a chassis dyno needs far far more cooling than an engine dyno for example.
My aim is to be able to do 10 power runs on an 800bhp 4wd vehicle that are all within 1% of each other.
Anyone who has ever had 10 power runs done back to back on a chassis dyno will know how hard that is to achieve (But perhaps wondered why?)
Last edited by Stu @ M Developments; 16-11-2012 at 08:17 AM.
16-11-2012, 08:36 AM
#141
Absolutely Stu, it's quite a difficult topic. By making it a cell, has made it much harder for you, but obviously when it's up and running, and working really well, it will be WELL worth it!!
From experience though, don't underestimate how long it can take to get to that point 
From experience though, don't underestimate how long it can take to get to that point
23-11-2012, 11:48 AM
#158
I've found that life I needed.. It's HERE!!
I presume its to do with the way the rollers are driven? (Think of when peddling on a bicycle, one way has drive, the other doesn't.)
23-11-2012, 01:49 PM
#159
ST by Name and by Nature
Looks the dogs, bet you are all pleased with your hard work. Good to see a thorough and professional approach to RR setup, compared to some I've been on.
23-11-2012, 03:48 PM
#160
PassionFord Post Whore!!
