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#2 compression = 60

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Re: #2 compression = 60

Postby ObnoxiousBlue » Sat Feb 04, 2017 1:27 am

The BD heads are AMC's. They're great castings but everything else about them is absolute junk. There are. Certainly enough folks who install them as is and run them as long as able. But the valves, seats, essentially everything but the casting itself are crap.
I have a set of Len Hoffman's heads on the way. Same cast head but gutted and upgraded everything else.
Problem with most originals you might come across is they've been rebuilt and rebuilt and rebuilt, or have cracks and aren't rebuildable.
You can absolutely run the AMCs out of the box, but don't expect them to last forever.
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Re: #2 compression = 60

Postby Markus » Mon Feb 06, 2017 8:03 pm

ugh, yeah. Hmmm.
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Re: #2 compression = 60

Postby Markus » Thu Feb 09, 2017 8:31 am

Do I need to hone these new BD cylinders?

or if I see cross hatching its ok?
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Re: #2 compression = 60

Postby Raj » Fri Feb 10, 2017 8:39 am

Markus wrote:Do I need to hone these new BD cylinders?

or if I see cross hatching its ok?



If they are 'new' I would think they would not require to be honed. Agree that cross hatch is a good sign that they are good to go.
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Re: #2 compression = 60

Postby Markus » Mon Feb 13, 2017 8:51 am

Right, in fact they come with the pistons installed in the cyl. If I can assume the ring gaps were positioned properly I could install them on my engine and no need to buy or borrow a ring compressor.
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Re: #2 compression = 60

Postby Raj » Mon Feb 13, 2017 11:39 am

Markus wrote:Right, in fact they come with the pistons installed in the cyl. If I can assume the ring gaps were positioned properly I could install them on my engine and no need to buy or borrow a ring compressor.



Id recommend cleaning the inside of the clys to remove any coating used during storage/ shipping. Also you may want to confirm the ring gaps are positioned around the cly correctly and rings are not put in upside down ( if applicable) Also, given the cost of the ring compressor, its small insurance to ensure all is good to go.
Glenn wrote:I have to say, this "gruppe" is so much more than just a car club.


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Re: #2 compression = 60

Postby B MAN » Wed Feb 15, 2017 12:12 pm

Markus wrote:Right, in fact they come with the pistons installed in the cyl. If I can assume the ring gaps were positioned properly I could install them on my engine and no need to buy or borrow a ring compressor.



gotta scrub them down & position them yourself

i live in hempstead and have a spring compressor u can borrow
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Re: #2 compression = 60

Postby Markus » Tue Feb 21, 2017 3:24 pm

Cool, thanks for the advice. Pep boys might have something in the loaner section.
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Re: #2 compression = 60

Postby Tom » Wed Feb 22, 2017 9:48 am

I'm not an air cooled snob , I like them all !

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Re: #2 compression = 60

Postby Markus » Tue May 16, 2017 9:01 am

Had a bit of a snafu with some spark plug threads but the heads are on. Currently putting tins and fan hub, alternator back on (wish I had made a note of the order in which all this stuff needs to go back on).

Is there a trusted break in oil? Or will any old 10w40 do?

First oil change at 100 miles, 500 miles? Both?
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Re: #2 compression = 60

Postby Raj » Tue May 16, 2017 10:39 am

Markus wrote:First oil change at 100 miles, 500 miles? Both?


I dont think you can ever change your oil too frequently; the down side comes to the cost benefit of 'cleaner oil' as the added time and expense of the material. On a new build that I put some money into... id opt for the more frequent interval erring on the side of caution.

Im excited for the results!
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Re: #2 compression = 60

Postby Glenn » Tue May 16, 2017 10:57 am

I use Brad Penn breakin oil and then switch to Brad Penn 10W-30 after.

First run for 15 minutes varying the speed between 2000-2500rpm. After, dump the oil and let cool. When cold, adjust the valves and refill with fresh breakin oil.

Second run for 15 minutes varying the speed between 2000-2500rpm. After, dump the oil and let cool. When cold, adjust the valves and refill with fresh 10W-30.

Drive for 100 miles making sure to vary the speed and that the engine us "under load" to breakin the rings. After 100 miles, dump the oil, let cool and adjust the valves.

At 500 miles, dump the oil, let cool and adjust the valves.

At 1000 miles repeat.

At 3000 miles do regular oil and valve adjustments every 3000.

Oil is cheap, so better to do it more often than less.
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Re: #2 compression = 60

Postby Markus » Tue May 16, 2017 12:33 pm

wow thats a pretty intricate break in but I'm up for it. I'll assume a few minutes at start up to just let it idle and warm up.

Mike, you going to run it like this?
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Re: #2 compression = 60

Postby Glenn » Tue May 16, 2017 3:52 pm

Markus wrote:I'll assume a few minutes at start up to just let it idle and warm up.

Nope, get it running and let it rip.

Have a timing light connected so you can set the timing as it's breaking it.

If you let it idle at startup you'll have low oil pressure and could damage the cam/lifters.
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Re: #2 compression = 60

Postby BusBq Bill » Tue May 16, 2017 3:54 pm

Don't let it idle during initial break in!
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Re: #2 compression = 60

Postby Raj » Wed May 17, 2017 8:28 am

Glenn wrote:If you let it idle at startup you'll have low oil pressure and could damage the cam/lifters.



interesting.... Part of me would think that the higher revs right off the bat wouldnt be the best idea. Makes sense re: oil pressure though.
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Re: #2 compression = 60

Postby Markus » Wed May 17, 2017 8:46 am

gotchya. and i can at least static time it beforehand, then dial it while running.
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Re: #2 compression = 60

Postby Tom » Wed May 17, 2017 12:08 pm

He has hydro's so I don't think he needs to do the frequent valve adjustments you mention, maybe after 5k if he replaced them which I doubt.
I'm not an air cooled snob , I like them all !

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Re: #2 compression = 60

Postby Markus » Thu May 18, 2017 7:46 am

the engine is actually an earlier 2.0. they are confirmed solid lifters.
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Re: #2 compression = 60

Postby SUMTHING » Thu May 18, 2017 8:24 am

78' was the first year of hydro's (why I put one in my 73')
we know that the early bird gets the worm however,
the second mouse gets the cheese.
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Re: #2 compression = 60

Postby Tom » Thu May 18, 2017 2:18 pm

Markus wrote:the engine is actually an earlier 2.0. they are confirmed solid lifters.



Why would I assume he has the original engine ? :oops:
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