 Fred's 2375 Rebuild Thread |
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| friethmiller |
 Dec 31 2024, 12:12 PM
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#1
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Senior Member  Group: Members Posts: 751 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region 
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[A softball question for the Ninja and/or others]
This is the cam card that came with my 2357 engine, which was originally built by Rimco/Fat (long block) a few years ago. Can someone explain why with an intake/exhaust of 448, the lift was only set to 327 degrees? I'm about to rebuild my motor and a lot of focus will be directed at piston "deck clearance" and the valve train geometry that wasn't set correctly. Thanks.  |
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Replies
| technicalninja |
Jan 5 2025, 12:25 AM
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#2
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Advanced Member Group: Members Posts: 2,377 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region
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You have accurate tools.
You measured close to .003 P-W You DON"T have a choice, the bores must be at minimum honed by a machine shop with real honing machine. This will add some clearance... One thing I'd do is add moly coating to the skirts of the piston. This will tighten the clearance a small amount. Having the suggested P-W clearance and ring gaps from KB would help. I've seen old posts by Raby talking about these, His roll pin incident and his (At least then) suggestion of Hastings rings. I think he mentioned ring gaps. |
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Posts in this topic
friethmiller Fred's 2375 Rebuild Thread Dec 31 2024, 12:12 PM
technicalninja It's probably showing actual lift of the lobe.... Dec 31 2024, 12:31 PM
friethmiller
It's probably showing actual lift of the lobe... Dec 31 2024, 12:45 PM technicalninja looking again that whole cam card is at .050!
... Dec 31 2024, 12:50 PM friethmiller
looking again that whole cam card is at .050... Dec 31 2024, 01:09 PM technicalninja I'd have to see the cam card on it.
I'd l... Dec 31 2024, 01:38 PM technicalninja Changing cam in a T4 means "all the way down... Dec 31 2024, 02:13 PM friethmiller Ok, I've changed to name of this thread to han... Dec 31 2024, 02:50 PM technicalninja WOW!
Was that engine in the car the time you ... Dec 31 2024, 03:28 PM technicalninja Pics please!
Clean and label all of the split... Dec 31 2024, 03:39 PM friethmiller
Pics please!
Clean and label all of the spli... Dec 31 2024, 04:44 PM friethmiller Engine pics
Tear down:
... Dec 31 2024, 05:39 PM friethmiller More Pics
Camshaft:
[u]Camshaft Bearings:
... Dec 31 2024, 07:06 PM friethmiller More Pics:
Note: any perpendicular marks are from... Dec 31 2024, 07:23 PM friethmiller Crankshaft Journal Measurements:
Note: main jour... Dec 31 2024, 07:51 PM technicalninja Reality check...
I never said anything because it... Jan 1 2025, 10:28 AM friethmiller
Reality check...
I never said anything because i... Jan 1 2025, 11:06 AM technicalninja Are the pistons true flat tops with no valve depre... Jan 1 2025, 11:08 AM friethmiller
Are the pistons true flat tops with no valve depr... Jan 1 2025, 11:19 AM technicalninja I MAY have a close machine shop.
Replacing everyt... Jan 1 2025, 11:28 AM friethmiller Web Cam has a 494 grind with a 1” base circle me... Jan 1 2025, 02:08 PM technicalninja Those might not be JE pistons!
I have 2 new s... Jan 1 2025, 02:24 PM technicalninja Looked at that cam. That wouldn't be my first ... Jan 1 2025, 02:47 PM friethmiller Interesting, I'll take a look here in a bit. ... Jan 1 2025, 03:25 PM technicalninja Flat top 96mm 82 stroke. 593.53 CC swept volume. T... Jan 1 2025, 03:42 PM technicalninja Those ARE Keith Black "silverlines".
Tha... Jan 1 2025, 04:03 PM friethmiller
Those ARE Keith Black "silverlines".
Th... Jan 1 2025, 05:56 PM technicalninja I noticed it almost looks like those have a solid ... Jan 1 2025, 04:14 PM Jack Standz Just some thoughts and first impressions.
Thos... Jan 1 2025, 04:56 PM friethmiller
Just some thoughts and first impressions.
Tho... Jan 1 2025, 06:08 PM Jack Standz Since you're rebuilding the motor, let me sup... Jan 1 2025, 05:20 PM friethmiller 9.7:1 Compression Ratio. Damn! That is hot... Jan 1 2025, 06:20 PM technicalninja Intake and exhaust are fine, should support deep i... Jan 1 2025, 07:25 PM technicalninja The pinning is not a big deal.
Needs to be done o... Jan 1 2025, 07:33 PM friethmiller Going to cc the heads first. I measured the ID of... Jan 2 2025, 08:56 AM technicalninja The above looks good.
Easier to see the bubbles i... Jan 2 2025, 09:23 AM technicalninja These might help.
https://www.amazon.com/ABN-Cyli... Jan 2 2025, 09:26 AM friethmiller
These might help.
https://www.amazon.com/ABN-Cyl... Jan 2 2025, 09:44 AM Jack Standz If/when you get around to ceracoating things, as t... Jan 2 2025, 09:29 AM friethmiller
If/when you get around to ceracoating things, as ... Jan 2 2025, 09:46 AM technicalninja
If/when you get around to ceracoating things, as... Jan 2 2025, 09:55 AM VaccaRabite I've got some opinions here.
Remember that ... Jan 2 2025, 10:09 AM friethmiller
I've got some opinions here.
...
Zach
Z... Jan 2 2025, 11:21 AM technicalninja
I've got some opinions here.
Remember that... Jan 2 2025, 01:49 PM cgnj Falcor75 2270 made 158 to the wheels with 10:1, 86... Jan 2 2025, 02:24 PM friethmiller
Falcor75 2270 made 158 to the wheels with 10:1, 8... Jan 2 2025, 03:16 PM friethmiller Ok, Cylinder test via antifreeze titration says 60... Jan 2 2025, 03:22 PM friethmiller @technicalninja - Initial look at deck height her... Jan 2 2025, 09:14 PM friethmiller BTW. I’ll put the head stud back and tighten it... Jan 2 2025, 09:57 PM technicalninja Normal quench, .040"thick,96mm bore is 7.2 cc... Jan 2 2025, 10:10 PM friethmiller
Did FAT supply those pistons?
Yes, crank, cam, ... Jan 2 2025, 10:19 PM technicalninja I don't remember what gauges you had...
Minim... Jan 2 2025, 10:32 PM Jack Standz VaccaRabite made several good points about the CR.... Jan 3 2025, 12:17 AM friethmiller Thanks guys! My head is starting to spin here... Jan 3 2025, 08:56 AM technicalninja I'd go option 1.
JE does offer coatings done ... Jan 3 2025, 09:17 AM technicalninja I'd want the cam and its stuff to map out valv... Jan 3 2025, 09:32 AM friethmiller
Did you verify total stroke?
Need to compare CD... Jan 3 2025, 09:56 AM technicalninja Yep, how far down +/- deck height.
Dial caliper w... Jan 3 2025, 10:14 AM technicalninja At this "level" of engine I'd expect... Jan 3 2025, 10:23 AM friethmiller
At this "level" of engine I'd expec... Jan 3 2025, 10:32 AM friethmiller Ok :ninja: , I used the two shims under the #1 jug... Jan 3 2025, 11:02 AM friethmiller Ok, my 1.7L rocker arms do NOT have elephant feet.... Jan 3 2025, 11:26 AM technicalninja https://aapistons.com/collections/porsche-p...ston... Jan 3 2025, 11:45 AM friethmiller
https://aapistons.com/collections/porsche-p...sto... Jan 3 2025, 12:05 PM cgnj @[url=http://www.914world.com/bbs2/index.php?showu... Jan 3 2025, 12:59 PM friethmiller
[b]@[url=http://www.914world.com/bbs2/index.php?s... Jan 3 2025, 01:19 PM densible1 I had EMS http://www.europeanmotorworks.com do the... Jan 3 2025, 01:31 PM technicalninja Check with Eric @ Automotive Machine.
https://www... Jan 3 2025, 02:48 PM technicalninja And, if I could, I'd pattern the cam I chose o... Jan 3 2025, 02:56 PM friethmiller Thanks Rick,
I'll take my case and crank (+ ... Jan 3 2025, 03:17 PM burton73 @ friethmiller
I just spent a bit of time with Ma... Jan 3 2025, 03:30 PM densible1 @[url=http://www.914world.com/bbs2/index.php?showu... Jan 3 2025, 04:09 PM friethmiller
@[url=http://www.914world.com/bbs2/index.php?show... Jan 4 2025, 07:40 AM burton73
[quote name='densible1' post='3184740' date='Jan ... Jan 4 2025, 02:07 PM Montreal914 I am very far from being an expert but I did a lot... Jan 3 2025, 04:09 PM friethmiller
I am very far from being an expert but I did a lo... Jan 3 2025, 11:11 PM technicalninja That RAT engine used those same KBs and a big cam.... Jan 3 2025, 05:58 PM cgnj @Montreal914 [b]@[url=http://www.914world.com/bb... Jan 3 2025, 06:55 PM friethmiller
I have 3 cases that I'm going to drop off soo... Jan 4 2025, 05:51 AM technicalninja It would be useful to have the shim measurements.
... Jan 3 2025, 09:10 PM friethmiller
It would be useful to have the shim measurements.... Jan 3 2025, 10:25 PM Montreal914 2270 = 78.4 x 96mm
2258 = 78 x 96mm
78.4 cranks w... Jan 4 2025, 09:16 AM cgnj Since we are all spending your money, oil spray gr... Jan 4 2025, 11:19 AM friethmiller
Since we are all spending your money, oil spray g... Jan 6 2025, 01:59 PM technicalninja
[quote name='technicalninja' post='3184830' date=... Jan 4 2025, 11:32 AM technicalninja I would LOVE to know why the pics don't post o... Jan 4 2025, 02:55 PM Superhawk996 100mm
Jan 4 2025, 03:37 PM technicalninja At this level of build I would be hunting thermal ... Jan 4 2025, 03:45 PM technicalninja Thanks SH!
Look at how thick the walls are. T... Jan 4 2025, 04:01 PM technicalninja Need P-W clearance. If they "sized for forged... Jan 4 2025, 04:24 PM friethmiller Just got back in from welding on the front cross p... Jan 4 2025, 04:42 PM technicalninja and yet another thought...
I slipped a set of sto... Jan 4 2025, 05:05 PM friethmiller :ninja: Used a digital micrometer on all piston sk... Jan 4 2025, 08:18 PM technicalninja You need to be halfway down the skirt, below the p... Jan 4 2025, 08:32 PM friethmiller
You need to be halfway down the skirt, below the ... Jan 4 2025, 09:13 PM technicalninja That range is GREAT!
It almost looks like a .... Jan 5 2025, 12:04 AM friethmiller
You have accurate tools.
You measured close to ... Jan 5 2025, 10:20 AM technicalninja It's both the sight and the feel in tenths...
... Jan 5 2025, 01:43 PM technicalninja
:ninja: Used a digital micrometer on all piston s... Jan 5 2025, 03:39 PM |
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