I second that. I have only little experience with the Vizard books, but A. Graham Bell's book is my personal bible!

 

There's great stuff on there.

 

Good luck with the build, and well done on asking the question. If there were good options out there, it would be worth knowing about! Unfortunately there isn't, but generally it hasn't been a limitation either.

Cheers,

 

Will also pick the brains of a relative of mine. He was one of Harry Firths 1st apprentices and built engines with him

and Ian Tate. Hopefully some of his knowledge will be transferable to K motors.

I second that. I have only little experience with the Vizard books, but A. Graham Bell's book is my personal bible!

 

There's great stuff on there.

 

Good luck with the build, and well done on asking the question. If there were good options out there, it would be worth knowing about! Unfortunately there isn't, but generally it hasn't been a limitation either.

 

I'm currently reading Bell's book and I must agree with you.

I still plan on considering options such as a higher rocker ratio, but yes roller rockers are a bit beyond the scope of the build. In hindsight, I really did not express myself well to start with. I still plan on building a mildish 5k, the main aim being to have a killer midrange and useable powerband. The engine will be in for a few years so I plan on spending a bit of time and money getting it right.

I will look into various options more, as I want to end up with a well suited engine to my needs that has a nice amount of punch where I need it.

Just though Id pop my head in and let you know Yella Terra make off the shelf roller rockers for a K motor.

 

$998 a set when I last priced had none in stock. But will make more to sell if you buy 10 sets..LOL

 

So put me off as I would never find 10 people willing to spend $998 on roller rockers for a K motor but hey Yella terra do/did make them. There are sets out there a set was on evil bay a while back sold for $700. So keep your eyes open.

 

Cheers

Cameron

You saw those too Cam!!

 

I bid to like $450 and then gave up. Figured some junior speedway racer with a dad with deep pockets ended up with them! :locked:

Just though Id pop my head in and let you know Yella Terra make off the shelf roller rockers for a K motor.

 

$998 a set when I last priced had none in stock. But will make more to sell if you buy 10 sets..LOL

 

So put me off as I would never find 10 people willing to spend $998 on roller rockers for a K motor but hey Yella terra do/did make them. There are sets out there a set was on evil bay a while back sold for $700. So keep your eyes open.

 

Cheers

Cameron

 

Lol, not the cheapest upgrade for a k motor ! They are not really what I am after, especially at that price. In good time I will look at different rocker dimensions (without going for rollers) and see what is possible. If it's not possible then so be it, but at least I will have looked into it.

I understand a great amount will be in cam choice and headwork, but that does not stop me wanting to investigate options that others have seldom done or bothered investigating.

 

Thanks for letting me know Cam, I think your response is somewhat more productive than simply telling me "get a cam grind", because funnily enough I might have also thought of that ! lol

 

Cheers,

Dougal

Edited December 18, 200916 yr by Doogs

I think almost any gain you get will be lost in extra power needed to push the valve open $700 for rollers for a 5k and 1000 for a complete 7k with fuel injection, i know which way i would go

Some a series datsun roller rockers for sale.

 

http://datsun1200.com/modules/newbb/viewto...698&forum=2

HAHAH Taz I bid $695 on them they would suit my half built 5K :locked: But net dropped out and the winner got them for like $705 but rang the seller he used to be in speed way so I beta few old speed way guys have some good K motor gear kicking around.

 

Doogs I rang Yella terra when I saw these roller rockers for sale. He said they still have patterns and all for these and could make them a bit different if needed i.e change ratio so if your pockets are deep ring them they could do it.

 

But again I know the vavles on a ported K motor are to small id invest in getting bigger valves before pushing them open more. As even TRD motors didn't run roller rockers just shot peened stock ones and bigger valves so id look more into this path worked for TRD so see what you can do.

 

Cheers

Cameron

HAHAH Taz I bid $695 on them they would suit my half built 5K :thumbsup: But net dropped out and the winner got them for like $705 but rang the seller he used to be in speed way so I beta few old speed way guys have some good K motor gear kicking around.

 

Doogs I rang Yella terra when I saw these roller rockers for sale. He said they still have patterns and all for these and could make them a bit different if needed i.e change ratio so if your pockets are deep ring them they could do it.

 

But again I know the vavles on a ported K motor are to small id invest in getting bigger valves before pushing them open more. As even TRD motors didn't run roller rockers just shot peened stock ones and bigger valves so id look more into this path worked for TRD so see what you can do.

 

Cheers

Cameron

 

Thanks for the advice Cameron. I have been thinking for a while now that I would spend the $ and get some larger valves with ports to suit. (This engine is likely to be in the car for a few years so I am happy to spend a few grand on it.) I am glad to have had my suspicions about valves confirmed. I understand the rocker change is not really critical for a good power increase but mused that it might be worth it, (at a reasonable price).

 

Cheers,

Dougal

A few years on.

https://www.ikengineering.co.uk/product-page/toyota-3-4-5-7k-roller-rocker-kit-1-63-ratio

GBP648 (AUD $1240) inc VAT on their website

GBP825 (AUD $1578) inc VAT on their ebay site?

That's a lot of money.  And doesn't include postage.

No current listing on Yella Terra.  

I'm thinking of investing in some new pushrods and leaving it at that!  NLA from Toyota but I see there is a crowd that specialise in pushrod manufacture.  

Jet Engineering.  And they are in Victoria!  Shall see how much they are.

 https://www.jetengpushrods.com.au/

I've been very tempted buy these in the last week. It is a lot of money for ultimately not a lot of gains though.