1999cc turbo land speed engine 174 mph

[WickedWagens]

This year we decided to try some new things. I lost 2 of my Bonneville records in 2020. I last ran in the 2.0 liter class in 2018 with a 1915cc and had a top speed of 162 MPH. I decided to rebuild and go get my records back from the turbo SAAB that bumped them up to 162 and 168 mph. My Buddy Juan Cole and I started talking about what parts we had and what to try out for this year.
We started with an as-41 case. Instead of the 69 mm crank we had DPR make a 72mm to get right up to the class limit of 2000cc. The rest of the parts were what Juan had around his shop.
AS-41 case
72mm DPR crank
fk-98 cam
Pauter 1.4 roller rockers
94mm Pistons
DRD L7 heads
cb650 springs

I got the engine from Juan and put my turbo system on it and got everything running, plumbed, and broke in. We went out to Speed Week at the Bonneville Salt flats and started to get some runs in. The first few passes were right at 144 mph and only 6 lbs of boost. I kept turning the boost controller up and up, but it just wasn't making the same boost as with the 1915cc. I don't know why the boost controller was acting so different, but that ended up being the issue.
Once up to 8 lbs it ran 149 mph, 12 lbs = 154 mph, and 15 lbs finally got us to qualify on the 162 mph record with a 168 mph run. The next morning I turned it up to 16 lbs of boost and I ran 170.726 mph average over the 3rd mile with a top speed of 174.2 mph. When we went to pump the engine to certify the record and verify the engine size with the officials we found that 5 of the 8 aluminum valve spring retainers had broken. We were still bale to certify the record and put it in the record book at 169.462 mph.
Once home I pulled the heads to make sure no valves had hit the head. Luckily the inner springs did the job and there was no more damage. Juan took the heads and rebuilt them and switched to chromolly retainers as we only had a short time to get the engine ready for the second meet of the year.
With everything back together the second time we headed back out for the World of Speed event. On the first run at 6400 rpm 2 of the Bugpack pushrods decided to give up the fight and jumped out of the cups on the rockers. One of the other guys running had to go back to Salt Lake city and get parts. He was able to bring me back a set of cut to length pushrods. We made the replacements and massaged the pushrod tubes back round. We got in line and ran again. I babied it to 6500 in 1st, 2nd, and, 3rd. Once in 4th and at 5000 rpm it really started pulling. The engine was making 20 lbs of boost and running great. Then at 7000 rpm the engine nosed over and I thought the pushrods gave up again. I shut it down and headed back to the pits. After pulling off a valve cover I found that the rocker shaft had given up the fight.
The heads are going to get a rebuild with titanium valves, bigger springs, titanium retainers, and new rocker arms/shafts. Hopefully we can keep the valvetrain under control and not break anything. I can't wait to see what it will do next year!

[V8Nate]

Do you do any of the hvx mods?

[rubenski]

Wow, nice weekends. Seems u had a lot of fun. Except for parts breaking...

Now being somewhat in dragracing I see alot of issues with valvetrain, lifters and rocker shafts.

Guess tou just have to find the weakest link and reinforce it.



Verstuurd vanaf mijn SM-A515F met Tapatalk

[WickedWagens]

Do you do any of the hvx mods?

No, we don't. We seem to have enough oil where the HVX mods change things, so no need for it on our engine. We just need to get control of the valvetrain harmonics.

Wow, nice weekends. Seems u had a lot of fun. Except for parts breaking...

Now being somewhat in dragracing I see alot of issues with valvetrain, lifters and rocker shafts.

Guess tou just have to find the weakest link and reinforce it.



Verstuurd vanaf mijn SM-A515F met Tapatalk

Yep, We will continue to find the weak links and make our improvements. It was a bummer to break parts, but this is the first time in over 40 runs and 10 world records that we have broken anything, so it was bound to happen eventually. Still had a great time racing.

[Bruce.m]

Would you consider beehive valve springs to reduce the harmonic resonance? You’d need less pressure too.

[madmike]

For what Jaycee get$ for them rockers you'd think they wouldn't give up/Break Bummer ,,But like u said 40+run 10 records
can I ask what size jets in that Holley?

[WickedWagens]

Here is a link to a video of one of my runs.YouTube video of 168 mph run

[WickedWagens]

For what Jaycee get$ for them rockers you'd think they wouldn't give up/Break Bummer ,,But like u said 40+run 10 records
can I ask what size jets in that Holley?

It’s a 770 cfm Holley from RLR. The jets are 65 primary and 66 secondary. The secondary side does have 2 extra holes drilled in the float bowls for extra fuel, so those jet sizes aren’t fully relatable.

[madmike]

Yea I thought that might be one of Ron's carbs ,,2 extra holes,?, I'd like to see them next time u have it apart if ya don't mind?
all I've done to my 680 Quickfuel was Bootse reference the power valve

[Wally]

The heads are going to get a rebuild with titanium valves, bigger springs, titanium retainers, and new rocker arms/shafts. Hopefully we can keep the valvetrain under control and not break anything. I can't wait to see what it will do next year!

Great result!! Those Ghia's are slick and awesome to keep it straight at those speeds, wow!
I think I would need 500hp to run that speed in my super..

I quoted the above as I don't think you would really need anything more then the CB650's with Titanium valves. Even more spring creates only other issues imo. I run CB650's with 48/41 Ti valves and 1,48 Pauter rockers (type 4) at way over 8K. The 53 g tool steel Thorsten Pieper lifters I also use help greatly too I suppose. Keeping springpressure at bay has lots of benefits. I do realise that most (US) engine builders go the opposite way though, so this is just FYI

What fuel do you run? Must be really high octane with those conditions

[WickedWagens]

Yea I thought that might be one of Ron's carbs ,,2 extra holes,?, I'd like to see them next time u have it apart if ya don't mind?
all I've done to my 680 Quickfuel was Bootse reference the power valve

Here is a picture of the extra holes. They are about an extra 64 jet. About 1/16", .063”, or 1.6mm (a little hard to measure).

Wally, that’s great to hear about the cb650’s. We will lighten up the valve train as much as possible and maybe try them again.

[madmike]

Thanks for the Pic , I'll play with it this winter,,, cheers,Mike

[WickedWagens]

Thanks for the Pic , I'll play with it this winter,,, cheers,Mike

I think Ron does this to keep the jets in the lower range. I figured out the area of the 2 holes and it would be the equivalent of running a 90 jet on the secondary.

[madmike]

Yea that makes sense

[sled]

looks like maybe it would be worth adding the L shaped support brackets to the ends of the rocker shafts. The exhaust ends of the rocker shaft are inherently much weaker than the intake side.