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1300 heads with 83mm big bore kit
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fl59bug
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PostPosted: Fri Oct 09, 2020 6:55 am    Post subject: 1300 heads with 83mm big bore kit Reply with quote

Can 1300 heads be opened up to accept an 83mm big bore 40hp piston and cylinder? I'm thinking "Why couldn't they?" but wanted to take the lazy man's way out and ask others who have already tried Smile

Just asking because I believe switching my big bore 40hp to later heads with their angled intakes would open up a lot more possibilities.

Not looking to mess with the stock 64mm stroke of my engine and I'd like to keep my stock 40hp rods with their stock 20mm wrist pins. That said I'm only open to the idea of swapping the top end ie heads and intake manifold.

If I do go this route I'm also aware of potential issues with compression ratio and pinging (thats what flycutting and shims are for!) and the need to manipulate the 1300 intake manifold to fit the narrower engine with its 5mm less stroke. I thought about just cutting the ends off the manifold and using rubber boots and clamps, similar to the boots on a dual port setup. Not sure if that would work though.

Thanks for any feedback - Ted
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gears
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PostPosted: Fri Oct 09, 2020 4:16 pm    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

.
To really open up possibilities, try to source a set of Euro 1300 dp heads/manifolds.

If I recall correctly, 1300 heads may very well have the same cylinder spigot dimension as 40hp.
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fl59bug
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PostPosted: Fri Oct 09, 2020 4:26 pm    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

Thanks. I'd certainly be open to using Euro 1300 DP heads, but I'm not sure where/how to find them. I searched on "Euro 1300", "1300 Dual Port" and "Euro Dual Port" but found nothing.

I believe you're correct that the SP 1300 heads match the stock 77mm P&Cs that come on '61 - '66 engines. That said, although I'm running 83mm P&Cs, they have thinner walls to allow for the larger piston, and I believe they have the same O/D as the 77s, so I'm not sure why I was thinking the head spigots would need to be opened up. Oh well, I believe that question is answered Smile

Now the search is on for a good used or NOS set of 1300 S/P (or D/P if I can find them!) heads. I found several good S/P ones in the samba classfieds.
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PostPosted: Fri Oct 09, 2020 5:19 pm    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

Why not just just open the head for the later 1500cc /1600cc use the 1500cc barrels "83mm cylinders" and trim them down for your correct compression instead of using shims as is the 1500cc cylinders are longer and can be trimmed down instead of playing around with shims ...
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PostPosted: Sat Oct 10, 2020 5:46 am    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

The 1300 heads would be an improvement, they should accept the 83's those along with 82s which I had on a 40hp are all slip in. You cannot cut the manifold and use boots, the head is what it is bolted to to hold it, DP mani has a case mounting boss to hold it. you would have to cut, shorten and re weld it, or add a bracket so it mounts to case if you go the boot route.
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fl59bug
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PostPosted: Sat Oct 10, 2020 10:00 am    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

Thanks guys. The 1500cc heads/barrels are an option but I already have the 83mm big bore kit which I'm happy with, so I'd like to keep that and just swap heads. That stokes my interest in the 1300 heads.

RWK, I forgot completely about how on the dual port setups the center section has the boss that bolts to the case. I'm wondering if I could use something like what CB sells to get around that:

https://www.cbperformance.com/product-p/3151.htm

They are out of stock right now, but this manifold reportedly works with 28-34 carbs and at least from the pictures it appears to have a bracket welded on that is long enough to bolt to one of the center engine case bolts.
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fl59bug
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PostPosted: Sun Oct 11, 2020 5:08 am    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

With 1300 heads maybe I can ditch the center section single carb manifold altogether and just go to duals:

https://shop.kaddieshack.com/SINGLE-PORT-TYPE-1-EMPI-EPC-34-DUAL-CARBURETOR-KIT-47-7401.htm
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Lingwendil
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PostPosted: Mon Oct 12, 2020 8:42 am    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

fl59bug wrote:
With 1300 heads maybe I can ditch the center section single carb manifold altogether and just go to duals:

https://shop.kaddieshack.com/SINGLE-PORT-TYPE-1-EMPI-EPC-34-DUAL-CARBURETOR-KIT-47-7401.htm


personally I would do these-
https://www.cbperformance.com/product-p/3284.htm

if I'm not mistaken they come with a 26mm venturi which should be a good match.
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PostPosted: Mon Oct 12, 2020 10:17 am    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

thank you Lingwendil, I didn't know CB sold these.
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Lingwendil
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PostPosted: Mon Oct 12, 2020 10:29 am    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

You can hunt down a pair of small oil bath air cleaners to run on them too, they have the same neck as the stock carbs do Cool
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PostPosted: Mon Oct 12, 2020 1:30 pm    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

Nice! I can't wait to do this mod.
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Lingwendil
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PostPosted: Mon Oct 12, 2020 1:34 pm    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

I think with maybe a little jetting you should get a nice, strong, economical little engine out of it Smile
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PostPosted: Mon Oct 12, 2020 4:04 pm    Post subject: Re: 1300 heads with 83mm big bore kit Reply with quote

Lingwendil wrote:
I think with maybe a little jetting you should get a nice, strong, economical little engine out of it Smile


That's what I'm thinking - My little 40hp will be stronger than a "built" Okrasa 36hp, and should approach the output of a a stock-ish single carb'ed dual port 1600!
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