After a couple years since I put together my first big block cat triple I wanted to do another one that was a little bit better. I originally was going to put it in a pro rmk chassis like I've done with the watercraft triples but after collecting all the parts laying around my shop and a buddies there was more than enough to put together a pretty nice 1M vanamburg mod. 20 years later might as well get some use out of all this stuff!
Brand new (20 year old) vanamburg 144 1 inch taller hill climb style tunnel
1M drop and roll
New double pass cooler
144 Expert X suspension setback 1 inch
New146x2.5x2.86 pitch track
43" wide fabcraft chromoly a arms and billet spindles
RCS dual rate titanium springs on ACT remote reservoir shocks
brand New cat small pin 6 tower primary I had been saving for a project just like this
cat roller secondary
Boss seat
8 tooth extrovert drivers
SLP powder pros
outlaw Fiberglass hood
Racepak avenger 3
Matrix mid height pro taper bars
Custom wiring harness all factory connectors, hand warmers hi/low beam etc. I spent a lot of time hiding the electrical and coolant hoses for a clean finished look.
Prismatic Powders Gloss black trimmed out in illusion gambler green metallic all cleared over. Super chrome front end, pipes will be ceramic coated this summer, cylinders and heads will be polished out... Im running out of winter and just need it on the snow!
The engine is where it gets interesting. Im certain that this engine combination has never been built, many told me it wouldnt work!
I was going to do bored out factory 900 cylinders for M1000 pistons, but living close to Nate McCoy (who has built multiple world record holding engines) we put our heads together in March 2023 and came up with a game plan to take M1000 cylinders and modify them to fit the 900 twin style case. The HP potential of the 1000 cylinder is way more than that of the 900. It seems even bored and ported a stock M1000 cylinder will outperform the modified 900. The 1000 fought emissions back in 2007 so it was really choked down and limited from factory, and at a time when mod sleds took on a whole new world of boost. They work incredibly well turboed but not too many people went full mod NA M1000 engines. Jaws rates their 1000 twin pipes at a 28hp gain (at only 7500 RPM!) and 40+ HP when combined with porting. (60+HP in a 3 cylinder version rated at a low RPM ) SLP twin pipes work amazing on the 900 and are rated at 14-16 HP at 8100-8300 RPM and about an additional 8-10 with porting which I've done many 900s with that setup and they're runners when tuned correctly.
My last 1462 pulled very hard and was really conservative as far as compression and porting. It was similar to my 1500 race fuel watercraft triple with 48 lectrons.
I'm confident this new M1000 based 1462 on pump gas will make more power than my 1500 WC race trim engine. This new cat engine is built with fairly conservative porting, (there's definitely more to be had) 12.7:1 compression ratio and will have 40mm rack slides for now (I have a set of 48 lectrons if need be) the carbs will be the weak link for big HP. If it isn't enough Mike Visioni (Visi on here) is doing the same engine but the big bore 98mm version making 1725 CC's and will be the biggest displacement pro rmk sled out there when it gets finished.
I had a goal of getting it on the snow new years but custom stuff always gives you surprises! All the details are worked out and to replicate this will be pretty straight forward. I just now got it fired up and it sounds really nasty! I should have it on the snow to put some miles on it next weekend to see how it really works.
Here's how it started, a loose tunnel and bulkhead that needed to be mounted up and a bunch of miscellaneous parts and pieces.
Brand new (20 year old) vanamburg 144 1 inch taller hill climb style tunnel
1M drop and roll
New double pass cooler
144 Expert X suspension setback 1 inch
New146x2.5x2.86 pitch track
43" wide fabcraft chromoly a arms and billet spindles
RCS dual rate titanium springs on ACT remote reservoir shocks
brand New cat small pin 6 tower primary I had been saving for a project just like this
cat roller secondary
Boss seat
8 tooth extrovert drivers
SLP powder pros
outlaw Fiberglass hood
Racepak avenger 3
Matrix mid height pro taper bars
Custom wiring harness all factory connectors, hand warmers hi/low beam etc. I spent a lot of time hiding the electrical and coolant hoses for a clean finished look.
Prismatic Powders Gloss black trimmed out in illusion gambler green metallic all cleared over. Super chrome front end, pipes will be ceramic coated this summer, cylinders and heads will be polished out... Im running out of winter and just need it on the snow!
The engine is where it gets interesting. Im certain that this engine combination has never been built, many told me it wouldnt work!
I was going to do bored out factory 900 cylinders for M1000 pistons, but living close to Nate McCoy (who has built multiple world record holding engines) we put our heads together in March 2023 and came up with a game plan to take M1000 cylinders and modify them to fit the 900 twin style case. The HP potential of the 1000 cylinder is way more than that of the 900. It seems even bored and ported a stock M1000 cylinder will outperform the modified 900. The 1000 fought emissions back in 2007 so it was really choked down and limited from factory, and at a time when mod sleds took on a whole new world of boost. They work incredibly well turboed but not too many people went full mod NA M1000 engines. Jaws rates their 1000 twin pipes at a 28hp gain (at only 7500 RPM!) and 40+ HP when combined with porting. (60+HP in a 3 cylinder version rated at a low RPM ) SLP twin pipes work amazing on the 900 and are rated at 14-16 HP at 8100-8300 RPM and about an additional 8-10 with porting which I've done many 900s with that setup and they're runners when tuned correctly.
My last 1462 pulled very hard and was really conservative as far as compression and porting. It was similar to my 1500 race fuel watercraft triple with 48 lectrons.
I'm confident this new M1000 based 1462 on pump gas will make more power than my 1500 WC race trim engine. This new cat engine is built with fairly conservative porting, (there's definitely more to be had) 12.7:1 compression ratio and will have 40mm rack slides for now (I have a set of 48 lectrons if need be) the carbs will be the weak link for big HP. If it isn't enough Mike Visioni (Visi on here) is doing the same engine but the big bore 98mm version making 1725 CC's and will be the biggest displacement pro rmk sled out there when it gets finished.
I had a goal of getting it on the snow new years but custom stuff always gives you surprises! All the details are worked out and to replicate this will be pretty straight forward. I just now got it fired up and it sounds really nasty! I should have it on the snow to put some miles on it next weekend to see how it really works.
Here's how it started, a loose tunnel and bulkhead that needed to be mounted up and a bunch of miscellaneous parts and pieces.
Last edited:
