2838 type 4 buildup

Getbackontrack · Post by **Getbackontrack** » Wed Jul 15, 2009 1:20 pm

Im going to start this thread so the folks in here can follow the buildup of my 2838 type 4 engine..

Any inputs on the project will be apreciated.

So far I have a good (looking) 1700 case that I have cleaned up and pluged/tapped. A 200 mm flywheel that I have turned down to 5.3 kilos and cleaned it up on the clutch surface.

Next up is welding and installation of 48/40 valves in a set of 914 heads..

How do I put in pictures in this forum???

Regards, Jakob

bj · Post by bj » Wed Jul 15, 2009 2:20 pm

use the IMG buttons

you'll have to post the pictures on flickr or something and use the URL between the IMG tags.

i don't post pics, but i believe this is how this works.

bj

typ4 · Post by **typ4** » Wed Jul 15, 2009 5:28 pm

I have a cam in the for sale section you might be interested in.

bj · Post by bj » Wed Jul 15, 2009 6:43 pm

i was looking at that...was wondering...how would that cam do in a 103x80 for the street?

bj

Post by **Type 4 Unleashed** » Wed Jul 15, 2009 11:54 pm

That case is too clean...

When you surface the clutch surface area of the flywheel, you have to remove the same amount of material from the ridge where the pressure plate bolts to,
otherwise you loose clamping force on the disk, due to the increased distance from the clutch surface to bolting surface. And because of your 86mm crank, your
gonna need at least a Stage 2 Kennedy plate.

And if your car will be race only, then lightning the flywheel is ok, but if it's mostly street, then you should of kept it stock weight, a lightened flywheel will kill your
gas milage for 1, and low end throttle is harder to control..

And for adding pictures you can sign up on www.photobucket.com , copy your pictures their, and from their then you can copy & paste in your posts.

Pics:

Getbackontrack · Post by **Getbackontrack** » Thu Jul 16, 2009 7:00 am

Thanks for uploading the pics Richard.. The engine will be street/race.

I know what your talkin about and have ofcourse removedet the same amount of material on the ridge as well..

typ4 · Post by **typ4** » Thu Jul 16, 2009 9:37 am

bj wrote:i was looking at that...was wondering...how would that cam do in a 103x80 for the street?

bj

with dual carbs it would be great.

bj · Post by bj » Thu Jul 16, 2009 10:56 am

i don't want to hijack the thread anymore than i already have.

bj

i'll shoot you a pm or email.

Rolf · Post by **Rolf** » Fri Jul 17, 2009 12:14 pm

Hi Jakob,
What cam will you use? Reason why I ask is because the cam lift #'s will have a huge impact on what rods you can use. With a stroke of 86 mm the chance of ending up with rods hitting the cam is very very potential. Then you need very expensive Cunninghams connecting rods (@ +$1200). Another Danish dragracer did a lot of engine mock ups last year with serveral different cams to find a combo that would clear with CB rods, without any luck. But he wanted a lot of cam lift. You might be able to run a cam with reduced base circle and low cam lift and heavily cleared CB rods, but I doubt it very much. Knowing you, I think you want a lot of cam lift

You can see the thread tha Mflow recently started in this forum about rod hitting cam and he only have 80 mm stroke.
Just my 2 cent

/Rolf

Getbackontrack · Post by **Getbackontrack** » Fri Jul 17, 2009 12:47 pm

Hey Guys, im not going to run 86 mm stroke, dont know where you have that from, im going with a 82 or 80 mm stroke.. I havnt decided yet what the engine is going to "be used for" but its not going to be a drag engine only.

Im in a thinkin position at the moment regarding what cam to use...

Regards, Jakob

typ4 · Post by **typ4** » Fri Jul 17, 2009 8:55 pm

after building an 82, I would go 80 then use rods with 3/8 bolts if turboing, na I think 5/16 would be fine.

bj · Post by bj » Fri Jul 17, 2009 9:02 pm

x2 ^^

i think for an easier assembly...80 or 82 would be the best bet...along with a 78mm of course...just use a chevy or porsche 2.0 journal to make life easier.

what size pistons you using?

bj

Post by **Type 4 Unleashed** » Fri Jul 17, 2009 9:41 pm

Getbackontrack wrote:Hey Guys, im not going to run 86 mm stroke, dont know where you have that from, im going with a 82 or 80 mm stroke.. I havnt decided yet what the engine is going to "be used for" but its not going to be a drag engine only.

Im in a thinkin position at the moment regarding what cam to use...

Regards, Jakob

It was my fault, I mentioned the 86mm stroke. I am having a hard enough of a time keeping my builds straight, that I seem to have a hard time keeping everyone else's straight also...

, but there are 2 other builds that are using 86mm cranks.

BUT, I did remember this post, and a 84 x 105 is a 2909. But it's good to see you are now re-thinking things.

Getbackontrack wrote:What is the flow limit for a Type 4 head?

Im planning to build an 2838 cc (84x105)type 4 engine with a lot of cam and compression.

I was just wondering what would be possible to pull out of an engine like that with "stock" heads reworked with 48/38 valves and a pro porting job with welded intakes. Should I go larger on the intake by the way? 50 mm?

Regards, Jakob

fusername · Post by **fusername** » Sat Jul 18, 2009 6:39 am

that case is too clean, send it to me to take care of!

Getbackontrack · Post by **Getbackontrack** » Tue Jul 21, 2009 3:03 pm

Went to work the other day and made myself this angle plate so that I can bolt the head up on the mill plate and cut the holes for the new seats and bore out the old valve guides.

The plate still needs a bit of work before im satisfied with it, will cut a couple of flat surfaces on it so that I can bolt I tight to the mill plate. Head is being secured on the plate at the 4 rocker stud supports.

I also want to make 4 holes in it so that I can use it as a block for when im going to punch out the old guides.. By the way anyone know which way they should be punched out? Out through the intake and exhaust runners right? I know they have to be bored before I punch them out.

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