May want to rethink that K&N Air Filter you're using

If this was true more dirt would get into your engine at 7k rpm as compared to 1k rpm using the same filter. Does that make sense?

 

It is true. More air gets in at 7k rpm, too.

But you'd be hard-pressed to show a Ferrari engine that failed from dirt scratches on cylinder walls rather than from belt failure, fuel-pump failure, oil starvation, overheating, etc.

 

It's so interesting... from this post and one you had a few messages earlier, you seem to be advocating the position that since Ferraris won't be driven enough miles for the K&N to allow enough dirt in to actually wear it out, that it shouldn't be a concern for using a K&N.
This coming from the same guy that in the recent 348 thread had an additive that was needed for just about EVERY fluid in the car, as if no company could make a fluid good enough to protect or work right in your 348, but now, letting in extra dirt with a K&N is no big deal...?

What an interesting study in how peoples minds work and believe and rationalize what they want to believe! Not meant as a flame, just a very interesting (I think) observation.

 

I can see where you'd derive such an inference, but my intent was to demonstrate that we're only talking about marginal differences in filtration for marginal improvements in power, as well as to remind a few people that dirt comes in through all filters...

...that we aren't talking about pristine environments (such as what situations we want from our transmissions).

 

I used K&N filters on many cars. The replacement units definitely give better response on turbo engines. I ran one on a Lancia Thema turbo 16V (not known in the US, technical very much a Alfa 164) from new to 60.000 miles, cleaning it once. The Lancia has a Bosch Motronic 2.7 just as my Mondial. The car never had problems with the MAF and never missed a beat. The plumbing stayed absolutely clean inside. In parallel I had one of these modern 3- stage foam filters on the same engine but another car. Performance was very good, but the plumbing past the filter was extremely dusty after 15.000 miles. IMO even as the concept of K&N is really old, the work very well compared to other “revolutionary” performance filters.

 

Well then, I guess I've learned something new.

When I purchased them (the last one was probably in 91' or 92') they were more expensive than OEM.

Never noticed any power gain in the seat of my pant's either.

Still, I say they're overhyped by the manufacturer.

 

I still say they do exactly as advertised. They're resusable and do free up small amounts of hp and tq as verified by dyno testing in my application. And they carry a warranty. They don't make outrageous claims nor do they over saturate with advertising. So I fail to see how they are overhyped by K&N.

 

Their was an article in Forza where Carribou Engineering rebuilt a euro spec 308gt4 engine and tested at various stages of performance upgrades to test hp gains and I want to say that the K&N filter either added nothing or actually decreased HP over stock.

 

Can anyone out there please tell me the correct part number for a K&N air filter that will properly fit an 86 TR? I tried a 33-2532 but it did not fit well enough. Thanks.

 

33-2799

 

If you are serious about increased peformance, then a BMC carbon dynamic airbox is the way to go. Web site includes dyno data. BMC supplies the Ferrari F1 teram. http://www.bmcairfilter.com/

 

You are correct sir!

Current applications list:
http://www.ferrariclub.com/faq/knfilter.html

 

Thanks. The chart shows the 33-2799 for the TR is Europe only. Do you know of any good US source(s)?

 

I got mine from K&N directly.