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Old 09-06-2013, 07:50 PM   #26
Mogly
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Originally Posted by kendogg View Post
The 4 cylinders? Only once. I wasn't paying any attention to such things though. The 'thin strip of rubber' is a TV damper, thats what most cars use from the factory. They're perfectly sufficient.


Good read on the subject:

http://damperdudenz.tripod.com/id3.html
Cool. Still doesn't change the fact that b2?f/ft dont use dampers.
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Old 09-06-2013, 07:53 PM   #27
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Cool. Still doesn't change the fact that b2?f/ft dont use dampers.

OK. Whats the difference in the cranks then between the older and the newer 4 cylinders? If they're relatively the same, could a damper from one of the newer motors be added? Who's revved these motors high, I'm sure somebody has, some shop, some race team, somebody. What did they do? Any idea what failed?
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Old 09-06-2013, 07:54 PM   #28
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No, they dont interchange, and lots rev to 7, and with spring they rev higher
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Old 09-06-2013, 07:55 PM   #29
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No, they dont interchange, and lots rev to 7, and with spring they rev higher
OK, so it sounds like the bottom ends not an issue then?
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Old 09-06-2013, 07:56 PM   #30
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none in the slightest
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Old 09-06-2013, 08:00 PM   #31
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none in the slightest


Oh. Well....wtf. I feel dumb now, hahaha.
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Old 09-06-2013, 08:35 PM   #32
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But all that is internet hearsay.
I'd like some proof please...

This might have just been put on the backburner, as my motor has developed a worrisome noise. Could be the broken motor mounts (hopefully). Sadly diesel mounts won't be here until Monday... Sounds like the start of rod knock but only when boost comes on, and the driver side motor mount is completely split, so I hope it's just that. Does not do it when free revving the motor...

Kendogg, it's sad to hear about BMW I6s being so bad at high RPM. I used to spin my L28ET in my Z car up to 7500 RPM all the time. There was a few cars with built engines that spun close to 8k out at the track, two were 3.2l stroked and bored setups, but you're right, everyone of those ran an ATI damper. L28s and their bigger strokers didn't have problems with harmonics until 8500 or so. L20A's on the other hand, have been built to run 10k RPM.
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Old 09-07-2013, 01:10 AM   #33
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my old car had the limit set at 7, and I would rev to it on a regular basis. My b21ft never blew up. I guess thats my proof on my engine.

Also, take one of these things apart. The rods are beefy. Not beefy from an engineering standpoint, but beefy as in "we threw enough metal at the problem."

The 85-89 b230's went the polar opposite direction, with rods barely sufficient enough for everyday use. (In junkyards, they are the ones with rods through the sides [n/a or turbo] 99% of the time.) Volvo saw fit to upgrade them to a larger cross section.

90-98 Volvo upgraded the rods to ones that are fine for stock hp to about a 50% increase. There are enough people bending them at ~300 to warrant concern.
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Old 09-07-2013, 02:33 PM   #34
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The BMW/VW style bucket lifters (like I know the 16V heads have, do the 8V heads use the same style??) can take 8k rpm's. They'll tick a bit as the RPM's come down because they have a hard time keeping themselves pumped up at those kind of RPM's, but they'll take it. Rocker engines- completely depends on the rockers. BMW M20/M30 - no way. I've seen people snap the expensive billet rockers too.
What are you even on about? 8v lifters are solid, there is no need to keep themselves pumped up...there are certainly no rockers, so why even bring it up?
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Old 09-07-2013, 02:49 PM   #35
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What are you even on about? 8v lifters are solid, there is no need to keep themselves pumped up...there are certainly no rockers, so why even bring it up?
]

8V's are a solid lifter? Like, with shims, and valve adjustments necessary??
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Old 09-07-2013, 06:29 PM   #36
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]

8V's are a solid lifter? Like, with shims, and valve adjustments necessary??
Yes!
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Old 09-07-2013, 06:31 PM   #37
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Yes!

Oh hell, I didn't know that. Now I'm really glad I've never owned one.
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Old 09-07-2013, 06:42 PM   #38
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Why?
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Old 09-07-2013, 08:39 PM   #39
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Oh hell, I didn't know that. Now I'm really glad I've never owned one.
That's pretty silly...very silly. Buckets are the best way to open valves (that's why every performance engine since god knows when have used them if there is not some rule mandating otherwise).
You've heard of Fiat Twin cam, Ford DFV, BDA, DFX, YBB, YBT, BDG, BDG, and a bazillion other motors happy to spin up for LOOOOOOOOOOOOONG periods at very high rpm?

Checking intervals of 15,000 plus miles and seldom seldom needing adjust in under 40,000 miles. Shim on top makes changes very easy and unless using really insane cams and very loose clearances, not real danger to "tiddly-wink" out the shim..

Hydraulic bucket is good too but I prefer the solid especially when doing mods cause checking cam timing is kinda weird with hydraulic anything.

How one could say the would prefer lifters, pushrods, rockers all of which are problem filled parts is waaaaay beyond my comprehension.
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Old 09-07-2013, 08:50 PM   #40
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That's pretty silly...very silly. Buckets are the best way to open valves (that's why every performance engine since god knows when have used them if there is not some rule mandating otherwise).
You've heard of Fiat Twin cam, Ford DFV, BDA, DFX, YBB, YBT, BDG, BDG, and a bazillion other motors happy to spin up for LOOOOOOOOOOOOONG periods at very high rpm?

Checking intervals of 15,000 plus miles and seldom seldom needing adjust in under 40,000 miles. Shim on top makes changes very easy and unless using really insane cams and very loose clearances, not real danger to "tiddly-wink" out the shim..

Hydraulic bucket is good too but I prefer the solid especially when doing mods cause checking cam timing is kinda weird with hydraulic anything.

How one could say the would prefer lifters, pushrods, rockers all of which are problem filled parts is waaaaay beyond my comprehension.
Funny thing, I have never broken a rocker arm or bent pushrods since I got my Volvo and sold the Mercury. Oh yeah, it doesn't have that bull****.
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Old 09-07-2013, 08:53 PM   #41
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Funny thing, I have never broken a rocker arm or bent pushrods since I got my Volvo and sold the Mercury. Oh yeah, it doesn't have that bull****.


I'd post the million mile never been apart B230F again, but my photobucket is approaching it's monthly limit.

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Old 09-07-2013, 09:26 PM   #42
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Pushrods aren't perfect but this guy's done OK with them.

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