Freshly Rebuilt 1310. Bad Noise Or Lumpy Cam?
Best Answer zebigfatman , 17 March 2018 - 09:42 PM
Hi everyone, just wanted to say thanks for all the advice! Turns out it was the edge rockers hitting the inside of the cover. Munched some metal out of the cover and also filed down the corners of the rockers and it is fine now. Sounds good (despite the lack of vacuum advance)
https://youtu.be/XmE23eqFStc
Again cheers!
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#1
Posted 12 March 2018 - 06:39 PM
Engine specs (if it helps)
1310cc
Kent 286 cam
1:5 roller rockers (set to 18 thou)
Ported head with oversized inlets
4 bolt center main cap
KAD flywheel.
Running single 1-1/2 su carb for testing
Changed all ht leads
Played around with the timing.
All the work was done by me and its my first engine build so I'm reluctant to put it in the car unless I know its OK.
Links to video
https://youtu.be/gzChIhWBcP4
As always, cheers for your help guys!
#2
Posted 12 March 2018 - 06:48 PM
#3
Posted 12 March 2018 - 06:52 PM
quick question who built the engine?
#4
Posted 12 March 2018 - 06:58 PM
#5
Posted 12 March 2018 - 07:11 PM
Hate to say it but It does sound very knocky,
Have to say well done on cracking it up on the deck, not many of us do that.
Don't think it will be a cam / carb issue.
Did you have the block line bored for the 4 bolt centre main cap?
When you built it was the crank reground...?
Did you plastiguage the journals?
Was the crank checked for straightness?
and did you get the oil pressure up before starting it?
How much oil pressure has it ?
#6
Posted 12 March 2018 - 07:22 PM
Crank is brand new/old stock from Minisport due to the old one having been reground to many times
Bearings are the standard ones (came with the crank)
I have fitted an electric oil pump which primes and pressurises the it to 25 psi before starting the engine, (got a proper pump as well). Oil pressure sat at about 60psi when running
Cheers for your help!
#7
Posted 12 March 2018 - 07:30 PM
There is a noise for sure, but I don't think it too serious.
Check the rockers aren't tapping on the rocker cover, but I actually think it's a bolt in the clutch cover that's too long, eg, for the timing cover inspection plate or engine mount.
What type of Con Rods does it have? A or A+ ?
#8
Posted 12 March 2018 - 07:30 PM
i have to say I dont like the noise one bit. and i would not say it has anything to do with the cam.
#9
Posted 12 March 2018 - 07:37 PM
Really hope my flywheel isn't getting carved up because it is a thing of beauty. But again will check, I have bolted on the mount to that side.
The rods are standard A plus, pretty much the only part of the engine (excluding the block) which hasn't been changed
#10
Posted 12 March 2018 - 07:47 PM
Were the tolerances on the crank checked before fitting/matched with the bearings? To me (amateur builder) it sounds like the valve gaps are too large.
#11
Posted 12 March 2018 - 07:48 PM
worth trying without the rocker cover on .. mine made that noise when I tried fitting a metro turbo one
#12
Posted 12 March 2018 - 08:13 PM
duplex timing chain? modified the timing cover? also would say timinig is well out
#13
Posted 12 March 2018 - 08:16 PM
The valve clearances are 18 thou due to the 1:5 rockers. I did read somewhere on the forum that 18 was a good number for the cam-rocker combination, but happy to be corrected.
Will definitely try without the rocker cover on but won't get the chance till Saturday. Engine is at my mums and I am up to my eyes in an electronics's HNC
Anyhow thank you all, I have plenty to think about. Will post an update when I've checked out all the suggestions!
#14
Posted 12 March 2018 - 08:18 PM
#15
Posted 12 March 2018 - 08:54 PM
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