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HD-8 K&N Air Filter Conversion

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hmj6854

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Anyone else see the HD-8 K&N air filter and stub stack fast flow conversion in JME Healeys recent newsletter?
Looks interesting. Thoughts?
 
Nope; please post the info if possible.

I had a set custom made by David Anton of APT many years ago, with stub stacks inside. I'm glad I have them every time I go through a dust cloud; they dirty-up fairly quickly. David was willing to make a batch and I had a dozen or so owners signed-up to buy a set but his wife was injured in a car accident and he lost interest in the project.
 

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hmj6854 said:
Best I could do
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I have the K&N air filters shown in the top photo. They look great and I do like K&N products overall. However, there is a small bracket that is attached to mount the front flange which is held by an acorn nut. That bracket makes using a UniSyn almost impossible. Particularly the front carb. I now use the method that uses wires in the dash pots. I have just had my carbs off after cleaning and doing a minor rebuild. I am deliberating whether I will go back to original air filters or put the K&N carbs back on it. AN ASIDE: Replacing the nuts on the two bottom, interior mounting bolts is the most frustrating "simple" job I have ever attempted. It was hard enough to get the rear one off, but now replacing them is proving to be a bigger challenge. Definitely no thought by the engine designers for future maintenance. The throttle shaft needs to be able to be be separated with a coupling so it can be installed after the carbs are put back on the manifold.
 
Thanks for the input. Doesn’t sound like it is worth the hassle, plus the price for their kit is about £900 before shipping.
 
The 'wires in the dashpots' technique is credible, and I use it. Plus, it allows one to check airflow--and, at least indirectly, throttle position--across the range. But I do think UniSyns are a bit more accurate (maybe not enough to be worth the trouble). The canonical method for checking carb airlow is to read them separately--not very useful with the wires--then linked together.
 
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