New race engine...questions

[O Racer]

Hi All,

 

I am building a track day race engine for my 1991 Caterham Seven with AX Block Ford engine, 5 speed with DeDion rear. I have some engine questions as the parts are ready to go to the machine shop:

 

-I understand that you need to restrict the oil passage from the block to the head that lubricates the valve gear. The passage in the block is 5/16" in diameter. Any tips on how to restrict the flow, my idea was to thread the hole and screw in an allen head plug, drilled to the correct diameter...any suggestions on how much to restrict?

 

-I also understand you should block off the small lubricating hole in the connecting rods, true?

 

- When I mount my 5 port Titan Dry Sump Pump, will I have to modify the engine mount to clear intake oil hose and fitting on the pump?

 

Engine details...roller rockers, HD springs, cam with 4,000- 8,000 rpm range, 11.5:1 CR 84 mm CP forged pistons, lightened rods, new SCCA SCAT crank, lightened flywheel, dry sump, 4 to 1 exhaust

[Kitcat]

Sorry, I cant answer you questions. Wld be iterested tho, in knowing what hp/torque #'s you get from this overachieving little X-flow, once reassembled.

 

Also, what spec head are you using?

[O Racer]

Hi Kitcat.

 

Right now it is a stock head that came with the 1700 modified Super Sprint engine package,

with the larger valves and some porting in the head. The machine shop regularly works on Formula Ford and uprated Cortina engines so I will likely have them do some porting for the 45mm Webers and 4 to one exhaust, not sure yet. I will have the car on a dyno, will be glad (hopefully) to report great HP and torque figures but will be happy with what I get.

[dvl]

Have you talked with any of the Kent based race engine builders, such as Dave Bean, Craig Chima, Tony Ingram, Jeff at JAE, MWE, Ivey, or any of the others? I know Dave Bean sells press in restrictors for Twincams and BD-series engines, which are sometimes used on push-rod motors. I'm building a similar spec engine for track and street (it's been on my engine stand for a long time, while I work on other aspects of the car) and am not currently planning to run a restrictor. I'm interested to know what you're heard or hear.

Thanks,

Dave

[O Racer]

Hi Dave

 

I got answers for my questions:

 

Tony Ingram suggests plugging the oil passage to the head (5/16 dia. stock) and drilling an 1/8" hole. That was for my engine build and maybe different for others. I am having the machine shop thread the passage and screw in an allen head plug drilled to an 1/8"

 

He suggested not plugging the oiler in the connecting rod.

 

I found out that Caterham UK sells a modified engine mount that allows you to plumb a five port dry sump pump without hose/fitting interference

[dvl]

Thanks for the restrictor info. Tony (and his peers) are great resources and have been incredibly helpful to me over the years.

I forgot to mention the motor mount. The Caterham unit which clears the dry sump pump is nicely made. It fits well too.

 

Thanks again for the info.

Dave

[Sabbot]

The 5 port Titan pump with the scavenger pick up in the middle of the sump requires a modified right hand engine mount. I got mine from Sevens and Elans. I don't remember it being very expensive and as it's a tight fit with multiple bends I figured I would buy a new one rather than modify the old one.

Regards,

Stewart