keyring
Part of things
Posts: 913
Club RR Member Number: 47
|
Carb air filterkeyring
@keyring
Club Retro Rides Member 47
|
Jun 23, 2011 23:18:11 GMT
|
Now, this may turn into a facepalm thread, how ever, if i don't know the answer to my question, i thought i better ask before i go and do it. I have a hillman imp, standard carb etc, rather than putting the standard airbox back on, is there anything that would stop me just putting an elbow on top of the carb, and putting one of these bad boys  Closer to the engine lid, meaning it will be able to draw in more air in. Cheers |
| |
|
|
|
|
|
Jun 23, 2011 23:37:50 GMT
|
Now, this may turn into a facepalm thread No such thing as a stupid question.  is there anything that would stop me just putting an elbow on top of the carb, and putting one of these bad boys Yes, there is something. The problem is that the Imp is rear engined - and the carb intakes are perfectly placed to pick up a LOT of dust and dirt from the road. The engineers in the Chrysler Competitions Department used to call running without an air filter an "Instant rebore kit" - the grit just wears the cylinder bores away incredibly quickly. The general recommendations for an Imp are to go with either a pleated paper air filter (like the standard one) or an OILED cotton filter (eg. K+N). The OILED bit is very important - the oil captures a significant amount of dirt, where a dry cotton filter or a foam filter won't. Also, the standard Imp engine components are very well matched - there's no one massively restrictive part. To see much power gain you have to look at bigger valves, swapping the camshaft and carbs, and a better exhaust, all at the same time. So changing the air filter won't give you any power increase (unless the standard filter was completely clogged, in which case a new element would sort it out) - although it might make it sound a bit sportier. Finally, the Solex carb has been known to ice up in winter - the standard air box can be turned towards the exhaust manifold for winter running to prevent carb icing. Personally, I wouldn't bother. Put a new filter in the standard box - they're only a fiver - and put it back on. Save your money to upgrade the engine wholesale at a later date. |
| |
|
|
keyring
Part of things
Posts: 913
Club RR Member Number: 47
|
Carb air filterkeyring
@keyring
Club Retro Rides Member 47
|
Jun 23, 2011 23:42:42 GMT
|
Now, this may turn into a facepalm thread No such thing as a stupid question. Only stupid people, eh?  is there anything that would stop me just putting an elbow on top of the carb, and putting one of these bad boys Yes, there is something. The problem is that the Imp is rear engined - and the carb intakes are perfectly placed to pick up a LOT of dust and dirt from the road. The engineers in the Chrysler Competitions Department used to call running without an air filter an "Instant rebore kit" - the grit just wears the cylinder bores away incredibly quickly. The general recommendations for an Imp are to go with either a pleated paper air filter (like the standard one) or an OILED cotton filter (eg. K+N). The OILED bit is very important - the oil captures a significant amount of dirt, where a dry cotton filter or a foam filter won't. Also, the standard Imp engine components are very well matched - there's no one massively restrictive part. To see much power gain you have to look at bigger valves, swapping the camshaft and carbs, and a better exhaust, all at the same time. So changing the air filter won't give you any power increase (unless the standard filter was completely clogged, in which case a new element would sort it out) - although it might make it sound a bit sportier. Finally, the Solex carb has been known to ice up in winter - the standard air box can be turned towards the exhaust manifold for winter running to prevent carb icing. Personally, I wouldn't bother. Put a new filter in the standard box - they're only a fiver - and put it back on. Save your money to upgrade the engine wholesale at a later date. Shall go with a standard one then, it wasn't for power, or noise really, just for the fact i could have a laugh with a huge air filter sitting there haha. Cheers for the tip about turning the air box around during the colder months, will affectionately keep it in mind  |
| |
|
|
|
|
|
Jun 24, 2011 12:19:02 GMT
|
|
Those foam filter socks don't do very much anyway, they basically just keep out the birds and large rocks. Dust and sand has been known to get through them.
|
| |
|
|
