Converting Fuel/Oil to AN lines/fittings. What size adapters do I need - 95 Speedster

[egoods]

I've been asking a lot of questions lately... apologies for that, but I keep getting stumped! So, I have some 4AN and 6AN steel braided line with connectors from a project that I never ended up doing, and it occurred to me that these would be perfect to replace all (or part) of the lines in my boat. I can't for the life of me figure out white size the threaded elbows/connectors are though. The ones on the crankcase look like 1/4 NPT but that's just a wild guess. Anybody know where to point me?

Also, will I have any issues if I replace the oil/fuel filters with upgraded (and AN fitting equipped) in-line filters? I know the oil and fuel systems aren't super high pressure, would flow be a concern?

And yes, I'm aware this is overkill, but not only will it look neat, it should stand up to the abuse a bit better! Since I don't see a write up anywhere I do plan to take pictures and document how I end up accomplishing this.

 

[egoods]

Well, I think I've somewhat answered my own question. Unfortunately my pitch gauges and calipers have gone MIA recently (I suspect someone borrowed them and "forgot" to return them). So I used a tape measure, the paper trick, and a little bit of eyeballing.

I believe I was correct, it's NPT, and it looks like there's both 1/4 and 1/8. I'm not super well versed in hydraulic fittings but if memory serves me right I believe if it has tapered threads, with no flair, it's either NPT (or... I can't remember the other pipe fitting at the moment) OR it could be metric tapered... which wouldn't surprise me given that these are Euro engines. I'll keep digging, and see if I can find a 1/4 or 1/8 NPT and Metric Tapered fitting of some kind tomorrow and see how they fit.

Still curious about going with a larger oil filter and fuel filter... it shouldn't hurt flow but I'm a bit out of my depth with these engines/boats.

 

[racerxxx]

They're 1/4 npt, they're tapered. Just stick with the same oil and gas filter. Don't get fancy. I helped a guy who had big fuel filters on his jet boat before, it just doesn't push the fuel correctly.

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[egoods]

They're 1/4 npt, they're tapered. Just stick with the same oil and gas filter.

I was actually planning to keep the fuel filter since it's more of a fuel/water separator then a true filter. My local speed shop has some high-flow in-line filters... I may give it a shot, or not.

I'm definitely doing something with the oil filters, mine need to be replaced and I'd like something a bit more substantial. The flow requirements on the oil side should be very low if I'm not mistaken... it only injects a small amount compared to fuel.

If I run in to problems from not heeding your advise I promise to let you know so you can "I told you so" me

 

[racerxxx]

Trust me, don't over engineer it. Just put back what is on there. Many guys will throw in a Fram G2 fuel filter inline and that is it. I for one, leave my chit just like it left the factory. I've owned my Speedster brand new since 99', I never "upgraded" any fuel filters or oil filters. I still get the OEM fuel filters off ebay NOS. Honestly, I wouldn't even waste the time or supplies for the -AN fittings and braided hose. I've used it plenty in car applications for fuel, trans lines and cooling lines where you're disconnecting and reconnecting many times. It's great stuff for that, but your boat....It's not worth the effort in my eyes other than bling factor

 

[egoods]

Well I already have the -4 and -6 hose and a handful of connectors from a race car project that ended up going a different direction... into a wall... that's a story for another time. Anyway, I have several hundred dollars in hose and fittings sitting on my bench, $40-50 in adapters and ancillary do-dads doesn't seem so bad. I considered using the quick disconnects too... but those are $70 a pair, I'll save them for a more appropriate application. I've always enjoyed tinkering/modifying/hacking, from cars to computers and a whole litany of cockameme things in-between. It goes without saying, I have a tendency to go overkill or "over-engineer" quite a bit.