Ring seal and hp losses

[challomoner]

I've a new 2276 with 700 miles and I think I've an issue with ring seal in a couple of cylinders, I'm using grants and total seal second rings. I had issues when motor first fired up and I probably ran it too long without any load on it. Motor also runs too cool, I struggle to see 180+ oil temps. So I'm gonna fit a thermostat and flaps in the housing to help it warm up.

Quick question about hp losses with bad ring seat, I haven't done the leak down test yet but I know from cranking the engine over that 2 cylinders kick back like a mule and 2 don't, compression ratio is 10.5.1. Is it likely the power would suffer by maybe 10-15% due to ring seal?

[Cusser]

[challomoner]

Yep it's running fine, it's just got less compression in 1+3 than it has in 2+4 I've only judged this by turning it over with a wrench, I haven't done a leak down test yet but the conditions were ripe for a bad ring seat.

[jpaull]

How about some compression test numbers? Even a regular compression tester will tell you the story. Leakdown test is good but you dont even need that yet. I bet you find something else un related to rings

[challomoner]

Haven't done compression test yet either as I need a new tester, but I plan on doing both tests before pulling anything apart.

Its gotta be rings or valves right? Reason I suspect the rings is because of reading search results on here, I reckon my cylinders got a good wash out early on in its life and I know it's never got fully hot either.
I was out for a drive today and despite pulling the fan belt at start up to try get it hot I still only saw 180 oil temp when I went cruising, done around 50 miles mixed driving not babying it at all but it won't heat up.

[jpaull]

I wouldnt jump to any conclusions at all till doing a compression test. Throttle plates open, make sure valves are adjusted.

[challomoner]

[mark tucker]

what method do you use to adjust the valves? why mix grant&total seal rings? how were the cylinders honed? how was it assembled? did you oil the rings good when assembling?

[challomoner]

[challomoner]

Is anyone able to shed any light on hp losses through bad ring seating? Motor made 155hp on dyno was expecting 170ish so just wondering if it's losing 10-15 because of rings or whether my heads are limiting it.

[modok]

Monitor the blow-by to find out how well they seal under power.
The gapless ring usually checks good on a leakdown test no matter if they are good or not.

[jeffrey8164]

I’ve only just got my 2276 on the road three times now. I don’t have any Dino access but I’m thrilled so far. Pesky pushrod tube oil leak but everything else engine wise seems fine.
I have the oven thermometer style dip stick and even after a bunch of freeway load/unload, speed real fast for a minute, drive 75mph at 3500-4000rpm for an hour and it never read above 230.
I’m not running a separate oil cooler either. Just the stock doghouse cooler.

I’m sorry I cannot answer your question but I doubt you would lose 10-15hp through the rings. I could be wrong but that seems severe.

Is there a lot of blow by?

What heads, cam and carbs? I don’t see that information anywhere.
_________________
Volkswagen!
Turning owners into mechanics since 1938.

“Let he that is without oil throw the first rod”
(Compression 8.7:1)

[challomoner]

[challomoner]

[jeffrey8164]

Look for oil spray from behind the pulley. If you have a breather system, look inside and try to determine if it looks like a lot of oil is being collected or just a little.
Go to an auto parts store and borrow a compression tester and see what you’ve got to start with. You said you’re at 700 miles so everything should have settled in by now.
_________________
Volkswagen!
Turning owners into mechanics since 1938.

“Let he that is without oil throw the first rod”
(Compression 8.7:1)

[modok]

I think an old school way, would works similar to a leakdown tester, so you'd have an orifice of some particular size on the breather tube, and monitor the case pressure. knowing the size of the hole and the pressure you could determine CFM.

Or these days probably they have some kind of high tech meter thingy, and they may not know how it works. I'd have to ask my brother.

I'm not really an expert in that end of things, the "dyno and tuning nerds" should know more. They are the guys who NEED to know.

Personally, I don't really need to know exactly on what I'm driving.
I's either good enough, or it isn't. You know?

[challomoner]

[Pruneman99]

1-3 and 2-4 share a cam lobe..

[jeffrey8164]

263 duration? I hope that’s at .050.
_________________
Volkswagen!
Turning owners into mechanics since 1938.

“Let he that is without oil throw the first rod”
(Compression 8.7:1)

[challomoner]