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bcrazy
Samba Member
Joined: October 24, 2009
Posts: 231
Location: Oslo
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 Posted: Mon Jan 25, 2021 1:22 am Post subject: Another 1385... |
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Been going back and forth deciding to build a DP 1600 or build on my original 1200 engine.
Decided to do a 1385
Split the block yesterday, not measured anything yet, but everything looks really good.
This is the plan:
83mm P&C
1300 heads with a valve job on the intake and cleaning up of the port
8:1 or thereabouts
2x32PDSIT
Stock exhaust, with higher flowing end pipes (may cut the exhaust open and remove or drill bigger holes in the baffles inside)
Stock cam
Questions:
Should i opt for 1.25 rockers on intake or is it not worth it over 1.1?
Oil pump: is a blueprinted stock OK, or should anything else be done?
Engine analyzer estimates this to ca 60BHP, realistic? |
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fl59bug
Samba Member
Joined: November 23, 2005
Posts: 1976
Location: North Carolina
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| Posted: Mon Jan 25, 2021 2:11 pm Post subject: Re: Another 1385... |
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I'm fairly certain your combo will hit somewhere between 51-60hp easily.
As far as 1.1 or 1.25, 1.1 is no issue, but if you decide to use 1.25 rockers, be sure the pushrods don't make contact with the PR tubes. CB recommends their big mouth (racing) PR tubes when running 1.25 and up ratios.
Here is the setup I plan to use on my 1385 which currently has 1.1 rockers on solid shafts:
https://www.cbperformance.com/Super-Stock-Rocker-A...?CartID=15
and
https://www.cbperformance.com/product-p/psaprt.htm |
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Rome
Samba Member
Joined: June 02, 2004
Posts: 9651
Location: Pearl River, NY
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| Posted: Sat Jan 30, 2021 8:00 am Post subject: Re: Another 1385... |
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| Quote: |
| CB recommends their big mouth (racing) PR tubes when running 1.25 and up ratios. |
I just checked their website; those PR tubes are based on the 1600 length tubes (69 mm crank and wider engine). Unfortunately none offered in the narrower 1200 cc engine width.
| Quote: |
| 8:1 or thereabouts |
VW's Type 3 1500 S with the 1500 cc dual-carb single-port engines that ran those 32 PDSITs had approx. 8.5:1 CR. Needed premium fuel, though. My thought is to do more research on the CR and consider raising it to "mid 8's". |
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fl59bug
Samba Member
Joined: November 23, 2005
Posts: 1976
Location: North Carolina
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| Posted: Sat Jan 30, 2021 4:07 pm Post subject: Re: Another 1385... |
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| Rome wrote: |
| Quote: |
| CB recommends their big mouth (racing) PR tubes when running 1.25 and up ratios. |
I just checked their website; those PR tubes are based on the 1600 length tubes (69 mm crank and wider engine). Unfortunately none offered in the narrower 1200 cc engine width.
| Quote: |
| 8:1 or thereabouts |
VW's Type 3 1500 S with the 1500 cc dual-carb single-port engines that ran those 32 PDSITs had approx. 8.5:1 CR. Needed premium fuel, though. My thought is to do more research on the CR and consider raising it to "mid 8's". |
Hm, are you looking at these:
https://www.cbperformance.com/product-p/psaprt.htm
or these:
https://www.cbperformance.com/product-p/1565.htm
The former is adjustable from -.5" to +.5" under/over stock 1600 width. |
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