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 Newt
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| posted on May 9th, 2010 at 08:51 PM |
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Dual valve springs / bent push rod
Hi Guys,
Did a dummy assembly to check out push rod lengths etc with something I am putting together.
The heads came with dual valve springs. Previously running standard 1.1 lifters.
This time I was looking at 1.4 lifters.
Running an AP3 cam (lift 318" - dont know if that is before or after valve clearance).
I turned it over and it bent a push rod.
Is this normal?
Im thinking about going back to standard valve springs as I am not planning on reving it hard (thinking 5000 on Sundays).
Any thoughts? Is it normal for standard push rods to bend?
Cheers
Newt
It is as it is - If you didnt enjoy today, you've missed the opportunity.
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 matberry
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| posted on May 9th, 2010 at 11:00 PM |
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The dual springs will requir chromoly pushrods
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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68AutoBug
A.k.a.: Lee Noonan
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| posted on May 10th, 2010 at 12:39 AM |
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| Quote: | Originally
posted by Newt
Hi Guys,
Did a dummy assembly to check out push rod lengths etc with something I am putting together.
The heads came with dual valve springs. Previously running standard 1.1 lifters.
This time I was looking at 1.4 lifters.
Running an AP3 cam (lift 318" - dont know if that is before or after valve clearance).
I turned it over and it bent a push rod.
Is this normal?
Im thinking about going back to standard valve springs as I am not planning on reving it hard (thinking 5000 on Sundays).
Any thoughts? Is it normal for standard push rods to bend?
Cheers
Newt
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Yikes...
Those springs must have been strong... way too strong...
just imagine the pressure [and wear] on the camshaft lobes..
I could Never come to use dual valve springs unless I knew exactly what they were...
I wouldn't be just using stronger springs from other vehicles etc...
You can buy cut to length chrome Moly push rods...
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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Newt
Wolfsburg Wizard
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| posted on May 10th, 2010 at 01:02 AM |
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Thats a good question Lee.
I have no idea where the engine came from. My guess is that it was professoinally built in the 1990s (if not earlier) (its got welded heads to
relocate the spark plugs etc) (Valves 40x35.5).
The heads had also been flycut with the pots raised about 1.5mm.
The only identifyer on the case is the number 916 stamped on it (on top, on both halves, betweeen the fly wheel and the fan shroud).
Newt
It is as it is - If you didnt enjoy today, you've missed the opportunity.
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matberry
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| posted on May 10th, 2010 at 08:31 AM |
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The numbers on the case you speak of are identifing the two halves as a pair.
The dual springs are necessary for some larger cams and more rpm.... any engine is a carefully matched combination of components.
If the cam and lifters are of good quality, and quality oils are also used, NO premature wear will occur.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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Newt
Wolfsburg Wizard
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| posted on May 10th, 2010 at 10:08 PM |
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Thanks guys,
Figured out what was wrong. It was binding on the inner spring.
Something I hadnt seen before.
Cheers
Newt
It is as it is - If you didnt enjoy today, you've missed the opportunity.
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