C85 Engine up grade on n26658

[Mark Julicher]

Re: C85 Engine up grade on n26658

www.enginebaffles.com 907-892-8244

Airforms Inc. advertises baffles for 65 different aircraft models and their advertisement clearly says T-CRAFT. FAA PMA approved. Call for current pricing.

[barnstmr]

Re: C85 Engine up grade on n26658

Chuck,
Looking good man!!! I hope you have some good flying weather ahead this week to try out your new stuff. May I offer some constructive criticism? I see some things in your photos that perhaps need to be evaluated. Most are concerning powerplant cooling provisions. Your baffles look good, but there are some details that might be the difference between red-line temperatures vs. running cool.

1) I noticed you do not have the crankcase/oil sump cooling baffle installed. If you don't know the one I am talking about, See photo below I pirated from Cap'n Jon's website. In the hot summer time, you really will want this baffle installed. (C85's produce more energy than an A65... higher rpm... more friction, more power, more heat to get rid of). This baffle will direct air from the nose (just beneath the prop) though the underside of the crankcase and will channel some air over the oil sump. That rectangle hole in the nose cowl has a purpose, but I see some Taylorcrafts that don't have the crankcase baffle. Without it, the air is just sort of dumped into the cowl and spills down through the exit air ramp with no realized cooling benefit. Some of the older A65 installations did not have this, but it was added to combat red-line oil temps.


2) Also.... Your oil filter is an opportunity to get some heat out of the oil if you can get some air flowing around it. Thats one of the great things about these oil filter kits (in addition to the filtration). I suggest you consider adding a small blast tube off the rear baffle directed over the oil filter. A little goes a long way... and you don't want to rob too much air from cylinder cooling... you don't need a large diameter... a 1/2 inch tube will help a lot.

3) Alternator - which B&C model do you have. Those permanent magnet alternators are nice, but need some cooling air. Ask Bill Bainbridge (B&C) about this. Consider a 1/2 inch or 3/4 inch duct coming off the rear baffle with a scat hose blasting directly on the alternator. You won't be sorry.

4) I see on the left side rear baffle where your ignition wires go through the rear baffle... you have a pretty big hole there. I assume you plan to add a rubber grommet there. If not please do. and use some black RTV sealant there to plug up any air leaks. This will help retain cylinder cooling air in the forward plenum. Same goes for the right side.

You may have already planned on doing all of this so I may be speaking out of place here. But If not, I hope you don't mind my input. I know you have invested a lot in your airplane and powerplant installation. It will be awesome! I wish you the best of success.

Hope you still can make it to Fort Parker for the Fly-in next weekend!!!

[barnstmr]

Re: C85 Engine up grade on n26658

Chuck... Are you planning to re-weigh the airplane after all of this? ... or have you been keeping track of the removed/installed item weights and arms? You might be surprised to find a bit of a shift in the empty CG. Let us know how it comes out. It will be interesting.

[cvavon]

Re: C85 Engine up grade on n26658

well it runs and boy am i happy started right up ran grate taxied just a little and it feels strong the 65 would not pick the tail up with the brakes locked this one will and keep it up when brakes are let go will post video later.terry thank you for the input we had planed on some of your suggestions and will use the other ones they make sense

[cvavon]

Re: C85 Engine up grade on n26658

hay gang here is a link to the first start and run of the new engine


http://youtu.be/0HyTYSVoNRw

[cvavon]

Re: C85 Engine up grade on n26658

well here are the pics from today did little things oil breather Pleads and tide up wires waiting on tack and scatt hose maybe tomorrow

[cvavon]

Re: C85 Engine up grade on n26658

more pics

[cvavon]

Re: C85 Engine up grade on n26658

last of pics today

[M Towsley]

Re: C85 Engine up grade on n26658

Chuck,

Why the block off plate for the cowl??? Is that removeable?

[cvavon]

Re: C85 Engine up grade on n26658

Marty that has been that way when i bought the plain 7 years ago. I guess it makes it work like a pressure cowl never any heat problem185 oil temp 300 to 320 on cylinder head temps in the summer

[M Towsley]

Re: C85 Engine up grade on n26658

That is usually open. That is where the baffle on the bottom of the engine gets its airflow. At least that is the way I have seen it on everyone else's planes. Interesting...

[cvavon]

Re: C85 Engine up grade on n26658

that is way i did not put that baffle back on as it did no good on my plane talked to levi at air forms about this and we were on the same page the new planes use a pressure cowl that hole was making negative pressure in the lower cowl with it closed air comes in the top of engine an exits the bottom most 0200 in 150s dont have that thing under the engine and they are set up like i am in the top out the bottom and they run cool

[M Towsley]

Re: C85 Engine up grade on n26658

Ok, I just saw in the very first picture at the top of this page that baffle installed. I just noticed it is not on the engine in the other pictures.

[cvavon]

Re: C85 Engine up grade on n26658

the pic that you are looking at is some one else engine that terry sent as a sample marty

[barnstmr]

Re: C85 Engine up grade on n26658

Chuck...
Looks good. Are you going to weigh the airplane and determine the new empty CG? If not, I highly recommend it. Looks like you might have moved the CG forward a bit... this would explain how easy it is for the tail to come up. Also, you should really pay attention to oil temperature on the first few flights, and especially on hot days to see how she's running. I seriously recommend you consider opening that inlet back up and add a crankcase baffle. I realize your A65 was running cool... but now you have a lot more heat generating items stuffed in the cowl. I am sure you want that engine to last a long time. High temps will shorten its life.