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Location:
leumeah NSW
Registered:
November 2004
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roller rockers for a 4k hybrid
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Tue, 29 March 2005 02:58
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hey guys i have a 4k with a 3k big port head on it. Im just wondering if you can get roller rockers to fit this engine. And anywhere that i can get double valve springs. Im new to all this engine building stuff so correct me if im wrong about any of this.
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Location:
Tamworth
Registered:
August 2004
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 03:02
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Is it an overhead cam engine?
If so i wouldnt think it would be worth ur while to put roller rockers on it. Simply because overhead cams are already built very efficient making roller rockers less worth while then in a pushrod motor.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 03:04
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roller-rockers not so easy. would be helpful, but not worth the expense in a 4K, unless you are aiming for 9000rpm (for a short time  )
dual springs easy, i got mine from performancesprings.com.au and were for an FJ20. thhey have afew for a 4K (CB4 or similar)
Cya, Stewart
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 03:56
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| jeffro RA28 wrote on Tue, 29 March 2005 13:02 |
Is it an overhead cam engine?
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4K
 
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Location:
Finland
Registered:
June 2004
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 04:17
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what do you need roller rockers for, if you leave cam and followers stock?
don't know for 4K, but for 5K you can use chevy roller followers and custom made billet roller cam. few shops in here Finland makes bolt-on roller rockers.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 04:27
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what price are the 5K ones? they should be similar enough to 4K to adapt.
4K lifter is smaller bore so 5K followers won't fit 
wonder if it is more worth moving the rockershaft and increasing the rocker arm ratio, as well as rollers..
even so, the whole valve train sucks needs to be a lot lighter and less friction
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Location:
leumeah NSW
Registered:
November 2004
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 11:59
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alright guys im planning on doing a bit of a piston upgrade (oversized from nasons?? pistons) a bit of a cam upgrade and i will be running twin downdraught webers. Hopefully i will port and polish the bigport and have it revving in a decent high range. That should help out with the answers to my original post. 
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Location:
Adelaide
Registered:
February 2005
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 12:11
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i think someone a while ago mentioned datsun 1200 (A12) roller rockers being a close match to the k motor, could these be modified to fit?
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 12:23
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| oldcorollas wrote on Tue, 29 March 2005 13:56 |
| jeffro RA28 wrote on Tue, 29 March 2005 13:02 |
Is it an overhead cam engine?
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4K
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I see someone went fishing....
And got a bite
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Location:
East Maitland NSW
Registered:
December 2004
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 12:35
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I just got a quote today on datsun A14 roller rocker kit and it was in the range of $835. So unlesss it a race motor and your looking for every ounce of power you can drain from the beast then go for it. But otherwise "let it be"
hope this helps.
Andrew..
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Location:
Finland
Registered:
June 2004
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Re: roller rockers for a 4k hybrid
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Tue, 29 March 2005 13:25
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I will ask for the price for rockers, but as i said earlier it's no use to put roller rockers if you leave stock followers.
Many over 170hp N/A(dynoed) 5K engines have made with stock rockers and no problems at all
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Location:
leumeah NSW
Registered:
November 2004
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Re: roller rockers for a 4k hybrid
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Wed, 30 March 2005 07:14
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thats way too f@#*in expensive. i think i will save the cash and do other little things to the car instead. Should get a couple of good visual upgrades for that price.
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Location:
leumeah NSW
Registered:
November 2004
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Re: roller rockers for a 4k hybrid
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Wed, 30 March 2005 07:15
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just another quick thought. No one has seen these at a wreckers have they?
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Location:
East Maitland NSW
Registered:
December 2004
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Re: roller rockers for a 4k hybrid
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Wed, 30 March 2005 10:13
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Roller rockers??
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Location:
leumeah NSW
Registered:
November 2004
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Re: roller rockers for a 4k hybrid
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Thu, 31 March 2005 05:18
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Hey meat_rack where did you get that quote from?
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Location:
Finland
Registered:
June 2004
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Re: roller rockers for a 4k hybrid
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Thu, 31 March 2005 06:24
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Here is one of my friends 5K race engine. It has roller cam, (chevy) roller lifters, roller rockers(older version and custom made EFI manifold(cast aluminum).
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Location:
East Maitland NSW
Registered:
December 2004
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Re: roller rockers for a 4k hybrid
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Thu, 31 March 2005 06:33
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I got a quote from Yella terra. just look on ther website
http://www.yellaterra.com.au/
send an email to them telling what head it is and they will give you a quote.
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