Paul D Jones Posted September 18, 2002 Share Posted September 18, 2002 Just done some tests I know Caterhams mainly have holes in the bonnets for air filter but have a look if interested http://wscc.ggr.net/cgi-bin/BB/ikonboard.cgi?s=3d88d103576effff;act=ST;f=3;t=3970 Sorry carn't remember how to do here on this site. Paul. See My Car Here Link to comment Share on other sites More sharing options...
Jason Plato Posted September 18, 2002 Share Posted September 18, 2002 Similar results to some tests which I did a while back , I now run with the filter sticking outta the bonnet on the end of some stupidly long trumpets ... I have been told several times since that for every +10C increase in air temp you loose 3% power , so that is a potential loss of about 15bhp on my little K . Pasted from last post - "Dear all ....... I've been playing on the dual carridgeway today , attemping to determine if there is a significant difference in the air temperature at the air filter vs the ambient air temperature when at standstill , travelling at 40mph after 1 mile and 2 miles , then at 60mph after 1 mile and 2 miles and hence power loss or potential gain to be had . The car is out most weekends doing the Midland Speed Championship and I was trying to replicate the conditions prior to doing a timed sprint run . This usually involves bringing the engine up to temperature and then queing for about 5 minutes before going flat out for anything between 35 seconds and 2 minutes . My engine is 1600 K series set up with DTHTB's with an ITG filter , running without a hole in the bonnet . The exhaust manifold has insulation wrap . The temperatures were measured using 2 Comark air probes . One probe tie wrapped to the throttle cable sleeve coming out of the pedal box , which is directly in front of the filter/trumpets and , the second one tie wrapped to the front crossmember under the nose cone to measure the air temp entering the engine bay . Ambient air temp = 15C Engine temp on dash = 80-85C(Rising when stopped ) At standstill - engine running after 5 min : Crossmember temp = 19.5C Induction temp = 40.3C (Max) Travelling at 40mph after 1 mile Crossmember temp = 18C Induction temp = 29C Travelling at 40mph after 2 mile Crossmember temp = 16C Induction temp = 25C Then back to standstill , after 5 min : Crossmember temp = 18.9C Induction temp = 39.1C (Max) Travelling at 60mph after 1 mile Crossmember temp = 17.2C Induction temp = 27C Travelling at 60mph after 2 mile Crossmember temp = 16.3C Induction temp = 22C I then drove it all the way back down the dual carridgeway for 4 miles at around 70mph : Crossmember temp = 17C Induction temp = 21C SO ?? When I'm at the start line my induction air temp could rise to around 40C and it would only slowly fall to a best of 21C after 4 miles . Or more typicaly remain a minimum of 10-15C higher than the air which would be available if the filter / trumpets were sticking out of the bonnet(??) . Dave Link to comment Share on other sites More sharing options...
Mark H Posted September 18, 2002 Share Posted September 18, 2002 Now i understand what the air scope is for on the MOG site, the penny has dropped , having an older car with filters poking out the bonnet i could not work out what the scope was for 😳. and i call myself a mechanic The Latest Bentley Boy 😬 Link to comment Share on other sites More sharing options...
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