Other Franklin Information

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Franklin Parts

This outfit has been mentioned on the Reflector as a Franklin parts depot.

Uniair Parts

Timing

Comment on the timing. For a new installation, take it easy on the timing. The Franklin is spec'd for 28 to 32 degrees of advance. Breaking in a new engine, or cylinders results in higher temperatures. Retarding the timing a little will help you manage engine temps if you are having a hard time keeping your temperatures below redline.

Brian Michalk

Carb

The correct carburetor is a MA 4-5 10-4865 From: "Laurence Coen" <lwcoen at hotmail.com>

Oil Pressure

Thanks Mike. That helps a lot. Looks like I'm in the same ballpark. One time during cruise last Feb the pressure went down to 30 and then back up which prompted me to add the washers. Now it's looking like it might be the pressure sensor. John

Michael Watson wrote:
In flight Oil temp 195 F /91 C 24 inHG 2550 RPM I'm showing 46 psi.I have the stiffer spring and 5/8 insulated oil lines. I am taking oil pressurefrom position 7.1 and oil temperature from position 7.2.On ground OAT 89 F / 32 C 900 RPM oil temp 110 F /43 C just before takeoff, oil pressure reads 38 psi increases to 53psi mid takeoff roll. After that point , eyes out the window no more monitoring, sorry : )Hopes this helps.

John Dibble aminetech at bluefrog.com wrote:
I removed the 3 washers behind the bypass spring. My oil temp was 9 C lower. The OAT was 7 F lower than the other day that I'm comparing thepressure to. At an oil temp of 88 C, my oil pressure was 50 psig. I'dlike to have some pressure/temp data from other Franklins to compare to

Bad running Franklin

Several of you have helped me search for a solution difficulties in getting my Franklin engine running properly. As a brief recap, I bought the PZL Franklin new about 5 years ago and flew it for about 26 hours. It never ran well which I attributed at least partially due to plug fouling. The rings never seated properly. I finally decided to re-sleeve the cylinders to get a softer grade of steel as liners. I sent the cylinders to Davis Aviation for new sleeves. I fly out of an elevation of 8200 ft and it is difficult to get manifold pressure.

After reassembly of the engine and re-installation, the engine ran worse than ever - back firing and popping and difficulty getting RPMs above 1500. I checked everything - induction leaks, carburetor function, mags, wiring, plugs - you name it - nothing helped. I tried to locate centerline intake valve angle but had difficulty locating these number. Eventually, Phil Davis of Davis Aviation located these numbers and sent them to me.

Saturday, mechanic John Welty and I used these numbers to check the center line angle for the intake valve on #1 cylinder and found the angle to be off 6 degrees. Instead of 104 degrees, the angle was 98 degrees. So, the engine was pulled once again. We took off the mags and accessories at the back of the engine and took off the rear cover. Then, we pulled the starter ring, revealing the cam gear and crank gear.

When rotated, the mark on the crank gear meshed between the two marks on the cam gear (or the other way around) just like the book said it should but the center line angle was wrong. We pulled the crank and cam gears and reset them so that the angle was correct. We had to move the gear one tooth - about 6 degrees.

After reassembly and reinstallation, we started the engine and it now appears to be running well. I have not yet flown it but intend to do so this week. It has been a frustrating - and expensive - several months trying to get this resolved.

I'm not sure why this happened but have a guess. It appears that the cam gear or crank gear was miss-marked. When the engine was test run at the factory, it likely did not run at all well. It appears that they opened the valve lash enough to run. When we reset the valve lash to the proper amount, the engine would not run. Now that the cam timing is correct, it runs with the proper valve lash. Sounds incredible but I can't think of any thing else.

If anyone needs or wants a copy of the valve lift versus angle, please contact me and I will e-mail the table to you. Thanks to each of you for your suggestions and help.


Jerry Teitsma
Granby CO
jerryteits at comcast.net


Valve Lift versus Engine Angle

Here is Jerry's data that I OCR'd and corrected. It is not exactly thesame because I took some liberties of pasting in the closed valverange. The open timings should be correct.

For reference, this is an unknown Franklin 6A-350-C1R. The title has: TITLE = NEWF
CYLINDER # = 1
FILENAME=NEWF16
12-20-12
TEST # 16
ADD -.34 TO CRANK DEG.

2 0.1002
4 0.1080
6 0.1157
8 0.1235
10 0.1314
12 0.1393
14 0.1471
16 0.1549
18 0.1620
20 0.1705
22 0.1782
24 0.1858
26 0.1933
28 0.2007
30 0.2080
32 0.2150
34 0.2220
36 0.2286
38 0.2354
40 0.2418
42 0.2481
44 0.2542
46 0.2600
48 0.2658
50 0.2712
52 0.2765
54 0.2815
56 0.2863
58 0.2909
60 0.2954
62 0.2996
64 0.3035
66 0.3073
68 0.3108
70 0.3141
72 0.3172
74 0.3200
76 0.3226
78 0.3250
80 0.3270
82 0.3289
84 0.3300
86 0.3319
88 0.3330
90 0.3340
92 0.3347
94 0.3352
96 0.3356
98 0.3358
100 0.3359
102 0.3360
104 0.3360
106 0.3360
108 0.3359
110 0.3356
112 0.3352
114 0.3347
116 0.3340
118 0.3331
120 0.3321
122 0.3308
124 0.3293
126 0.3276
128 0.3257
130 0.3235
132 0.3211
134 0.3185
136 0.3156
138 0.3124
140 0.3092
142 0.3056
144 0.3000
146 0.2979
148 0.2935
150 0.2890
152 0.2843
154 0.2794
156 0.2743
158 0.2690
160 0.2635
162 0.2579
164 0.2521
166 0.2460
168 0.2398
170 0.2333
172 0.2267
174 0.2199
176 0.2100
178 0.2056
180 0.1984
182 0.1909
184 0.1834
186 0.1758
188 0.1680
190 0.1602
192 0.1523
194 0.1445
196 0.1366
198 0.1287
200 0.1209
202 0.1133
204 0.1057
206 0.0983
208 0.0900
210 0.0842
212 0.0776
214 0.0713
216 0.0652
218 0.0595
220 0.0541
222 0.0490
224 0.0443
226 0.0399
228 0.0358
230 0.0321
232 0.0287
234 0.0258
236 0.0232
238 0.0209
240 0.0191
242 0.0175
244 0.0163
246 0.0152
248 0.0142
250 0.0133
252 0.0125
254 0.0117
256 0.0109
258 0.0102
260 0.0095
262 0.0088
264 0.0082
266 0.0080
268 0.0070
270 0.0060
272 0.0060
274 0.0050
276 0.0040
278 0.0040
280 0.0030
282 0.0030
284 0.0020
286 0.0020
288 0.0020
290 0.0020
292 0.0020
294 0.0010
296 0.0010
298 0.0010
300 0.0010
302 0.0010
304 0.0010
306 0.0010
308 0.0010
310 0.0010
312 0.0010
314 0.0010
316 0.0010
318 0.0010
320 0.0010
322 0.0010
324 0.0010
326 0.0010
328 0.0010
330 0.0010
332 0.0010
334 0.0010
336 0.0010
338 0.0010
340 0.0010
342 0.0010
344 0.0010
346 0.0010
348 0.0010
350 0.0010
352 0.0010
354 0.0010
356 0.0010
358 0.0010
360 0.0010
362 0.0011
364 0.0010
366 0.0010
368 0.0010
370 0.0010
372 0.0010
374 0.0010
376 0.0010
378 0.0010
380 0.0010
382 0.0010
384 0.0010
386 0.0010
388 0.0010
390 0.0010
392 0.0010
394 0.0010
396 0.0012
398 0.0012
400 0.0010
402 0.0010
404 0.0010
406 0.0010
408 0.0010
410 0.0010
412 0.0010
414 0.0010
416 0.0010
418 0.0010
420 0.0010
422 0.0010
424 0.0010
426 0.0010
428 0.0010
430 0.0010
432 0.0010
434 0.0010
436 0.0010
438 0.0010
440 0.0010
442 0.0010
444 0.0010
446 0.0010
448 0.0010
450 0.0010
452 0.0010
454 0.0020
456 0.0020
458 0.0020
460 0.0020
462 0.0020
464 0.0020
466 0.0020
468 0.0020
470 0.0020
472 0.0020
474 0.0020
476 0.0020
478 0.0020
480 0.0020
482 0.0020
484 0.0020
486 0.0020
488 0.0020
490 0.0020
492 0.0020
494 0.0020
496 0.0020
498 0.0020
500 0.0020
502 0.0020
504 0.0020
506 0.0020
508 0.0020
510 0.0020
512 0.0020
514 0.0020
516 0.0020
518 0.0020
520 0.0020
522 0.0020
524 0.0020
526 0.0020
528 0.0020
530 0.0020
532 0.0020
534 0.0020
536 0.0020
538 0.0020
540 0.0020
542 0.0020
544 0.0030
546 0.0030
548 0.0030
550 0.0030
552 0.0020
554 0.0020
556 0.0020
558 0.0020
560 0.0020
562 0.0030
564 0.0030
566 0.0030
568 0.0030
570 0.0030
572 0.0030
574 0.0030
576 0.0030
578 0.0030
580 0.0030
582 0.0030
584 0.0030
586 0.0030
588 0.0030
590 0.0030
592 0.0020
594 0.0030
596 0.0030
598 0.0030
600 0.0030
602 0.0030
604 0.0030
606 0.0030
608 0.0030
610 0.0030
612 0.0030
614 0.0030
616 0.0030
618 0.0030
620 0.0030
622 0.0030
624 0.0030
626 0.0030
628 0.0030
630 0.0030
632 0.0030
634 0.0030
636 0.0030
638 0.0030
640 0.0030
642 0.0030
644 0.0030
646 0.0030
648 0.0030
650 0.0030
652 0.0030
654 0.0040
656 0.00358
658 0.00362
660 0.00366
662 0.00374
664 0.00382
666 0.00394
668 0.00406
670 0.00429
672 0.00453
674 0.00488
676 0.00531
678 0.00591
680 0.00661
682 0.00748
684 0.00858
686 0.00992
688 0.01154
690 0.01354
692 0.01591
694 0.01862
696 0.02181
698 0.02551
700 0.02961
702 0.03417
704 0.03921
706 0.04465
708 0.05047
710 0.05673
712 0.06339
714 0.07031
716 0.07756
718 0.08496
720 0.09256