I'll have to pass on lexan windows and ducts, as I plan on this being a street car I can haul the fam in ocassionally.
I do want it to be a somewhat sleeper, hence the questions about air flow etc. so I can understand how to make necessary/wanted mods to the engine and intake.
FJC-ducks huh? Well why not, we've already got tons of chickens running around here in wy!
KG engine compartment air flow
- Jadewombat
- Posts: 1447
- Joined: Sat Jun 22, 2002 12:01 am
Re: KG engine compartment air flow
Found it, excellent article explaining why you need a pressure differential to increase cooling.Jadewombat wrote:Look at the link again on the wool tuft thread of the radiator flow (I don't remember exactly where I linked it but I will look for it again). Cooling is not just about surface area exposure or flow, it is about the ability for that heat to be carried away--meaning radiators, intercoolers, oil coolers, etc. work best when you have that high to low pressure differential across the oil cooler. If you have a poor engine seal you no longer have a good low pressure area in the engine compartment to channel that air directly from the high pressure area (decklid surface) down across the oil cooler and over the engine cylinders where it is carried away by the air passing under the car.
To put it another way, if the pressure is equal on both sides of the oil cooler the fan would have to work much harder to push the air across the cooler. Bajas don't really recirculate that air from under the car back up into the fan compared to all the other air being sucked in from the whole backside of the car.
http://www.autospeed.com/A_2159/cms/article.html
- Fiatdude
- Posts: 971
- Joined: Mon Oct 12, 2009 6:58 pm
Re: KG engine compartment air flow
A buddy just made a 158 pass on the salt and he had the rear lid slowly opening then slamming shut several times during the run -- so I would say that a lot of positive pressure is in the engine compartment at speed
Here is a cool ghia -- you can see what they did to the rear lid
http://www.youtube.com/watch?v=za1znivWZL8
Here is a cool ghia -- you can see what they did to the rear lid
http://www.youtube.com/watch?v=za1znivWZL8
-
- Posts: 71
- Joined: Fri Jan 01, 2010 12:35 pm
Re: KG engine compartment air flow
how about this one?
http://www.youtube.com/watch?v=DvzIkkWK8eg
I've thought of something similar, but having the whole front edge of the decklid lift up to allow more air into the engine bay, I suppose you could fashion some sort of bellows to direct it if you would like--and in theory use the high pressure to push air through the engine compartment.
I'm also very partial to the rear decklid vents on the KG concept car--I like the way that decklid looks!
http://www.youtube.com/watch?v=DvzIkkWK8eg
I've thought of something similar, but having the whole front edge of the decklid lift up to allow more air into the engine bay, I suppose you could fashion some sort of bellows to direct it if you would like--and in theory use the high pressure to push air through the engine compartment.
I'm also very partial to the rear decklid vents on the KG concept car--I like the way that decklid looks!
-
- Posts: 71
- Joined: Fri Jan 01, 2010 12:35 pm
Re: KG engine compartment air flow
I borrowed this pic from vwrobert over on the samba.
Would putting the two vents in the rear of the decklid, with two 356 grilles taking the place of the louvers be beneficial? Also, I'm thinking about pulling engine air from somewhere other than the engine compartment (ie from near tranny etc) as was mentioned previously. Would this help the airflow move through the engine bay? I'm thinking for intercooler purposes.